What are "C++ Variables" in Visual Studio's "Display Items"?

In Visual Studio, you can customize the font and color of any display items such as C++ keywords, C++ parameters, C++ local variables, function names, macros, etc. You can do so through selecting the menu "Tools -> Options -> Fonts and Colors".

In the setting dialog, I am confused by two "Display Items": "C++ Local Variables" and "C++ Variables".

"C++ Local Variables" is easy to understand. Say:

void f()
{
    int this_is_a_Cpp_Local_Variable;
}

I can set the C++ Local Variables to any font and color as I like.

However, I cannot understand what the "C++ Variables" are. I have tested and proved they are not global variables, no matter the global variable is a fundamental type or a user-defined type.

My question is: What's a "C++ Variable" in Visual Studio's "Display Items"?

Updates:

My test code is:

#include <iostream>
#include <functional>

using namespace std;

class A
{
public:
    int n;
};

A a;

class B
{
public:
    B()
    {
        int v;
        a.n
    }
};

void f(A a)
{
    a.n;
}

int main()
{
    int v;
    A a;
}

The vssettings:

<UserSettings>
    <ApplicationIdentity version="11.0"/>
    <ToolsOptions>
        <ToolsOptionsCategory name="Environment" RegisteredName="Environment"/>
    </ToolsOptions>
    <Category name="Environment_Group" RegisteredName="Environment_Group">
        <Category name="Environment_FontsAndColors" Category="{1EDA5DD4-927A-43a7-810E-7FD247D0DA1D}" Package="{DA9FB551-C724-11d0-AE1F-00A0C90FFFC3}" RegisteredName="Environment_FontsAndColors" PackageName="Visual Studio Environment Package">
            <PropertyValue name="Version">2</PropertyValue>
            <FontsAndColors Version="2.0">
                <Categories>
                    <Category GUID="{58E96763-1D3B-4E05-B6BA-FF7115FD0B7B}" FontName="Fixedsys Excelsior 3.01" FontSize="12" CharSet="1" FontIsDefault="No">
                        <Items/>
                    </Category>
                    <Category GUID="{75A05685-00A8-4DED-BAE5-E7A50BFA929A}" FontName="Fixedsys Excelsior 3.01" FontSize="12" CharSet="1" FontIsDefault="No">
                        <Items>
                            <Item Name="Literal" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="String" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppMacroSemanticTokenFormat" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppEnumSemanticTokenFormat" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppGlobalVariableSemanticTokenFormat" Foreground="0x000000FF" Background="0x00008000" BoldFont="No"/>
                            <Item Name="CppLocalVariableSemanticTokenFormat" Foreground="0x00000080" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppParameterSemanticTokenFormat" Foreground="0x00000000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppTypeSemanticTokenFormat" Foreground="0x00FF0000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppRefTypeSemanticTokenFormat" Foreground="0x00FF0000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppValueTypeSemanticTokenFormat" Foreground="0x00FF0000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppFunctionSemanticTokenFormat" Foreground="0x00000080" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppMemberFunctionSemanticTokenFormat" Foreground="0x00000080" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppStaticMemberFunctionSemanticTokenFormat" Foreground="0x00000080" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppClassTemplateSemanticTokenFormat" Foreground="0x00FF0000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppGenericTypeSemanticTokenFormat" Foreground="0x00FF0000" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppFunctionTemplateSemanticTokenFormat" Foreground="0x00000080" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppNamespaceSemanticTokenFormat" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="CppLabelSemanticTokenFormat" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                            <Item Name="VA X Brace Matching" Foreground="0x02000000" Background="0x02000000" BoldFont="Yes"/>
                        </Items>
                    </Category>
                    <Category GUID="{B36B0228-DBAD-4DB0-B9C7-2AD3E572010F}" FontName="Microsoft YaHei" FontSize="9" CharSet="1" FontIsDefault="No">
                        <Items>
                            <Item Name="Different content" Foreground="0x000014E5" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Identical content" Foreground="0x00000000" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Source Only" Foreground="0x00000000" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Target Only" Foreground="0x00000000" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Not Downloaded" Foreground="0x006D6D6D" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Even Row Items" Foreground="0x00000000" Background="0x00FFFFFF" BoldFont="No"/>
                            <Item Name="Odd Row Items" Foreground="0x00000000" Background="0x00FFFFFF" BoldFont="No"/>
                        </Items>
                    </Category>
                    <Category GUID="{E0187991-B458-4F7E-8CA9-42C9A573B56C}" FontName="Fixedsys Excelsior 3.01" FontSize="12" CharSet="1" FontIsDefault="No">
                        <Items>
                            <Item Name="String" Foreground="0x000000FF" Background="0x01000001" BoldFont="No"/>
                        </Items>
                    </Category>
                    <Category GUID="{FF349800-EA43-46C1-8C98-878E78F46501}" FontName="Fixedsys Excelsior 3.01" FontSize="12" CharSet="1" FontIsDefault="No">
                        <Items/>
                    </Category>
                </Categories>
            </FontsAndColors>
        </Category>
    </Category>
</UserSettings>

As you can see it highlights the different types of variables on your C++ projects. This is Visual Studio 2012 with a custom color scheme.

blue := local
green := global variable

So this is your code highlighted with my settings:

This is your colorsettings with background color red for local variables