What does the 'static' keyword mean when used with a global variable in C++?

Solution (By Examveda Team)

Reason: In C++, when the 'static' keyword is used with a global variable, it limits the scope of that variable to the file in which it is declared.

Option A: Scope limited to the file is correct because a global variable declared as static can only be accessed within the file where it is defined, making it invisible to other files in the program.

Option B: Can't be modified is incorrect because the 'static' keyword does not make the variable constant or immutable. It can still be modified.

Option C: Retains its value between calls applies to local static variables, not global static variables. Global static variables are not related to function calls.

Option D: Global scope is incorrect because the 'static' keyword specifically restricts the scope of the variable to the file, contrary to the global scope.

Hence, the correct interpretation of 'static' for global variables is that it limits the scope to the file where the variable is declared.