Which of the following statements about global variables is true? (A) A global variable is declared in the highest-level block in which it is used. (B) A global variable can have the same name as a variable that is declared locally within a function. (C) Global variables cannot be declared in C++. (D) A global variable is accessible only to the main function.

(B) A global variable can have the same name as a variable that is declared locally within a function.

Explanation:

The variables which are declared outside of all functions in the program are called global variables and variables that have scope limited to function or a block are called local variables.

For example:-

#include

using namespace std;

int g=50;

int main ()

{

int g=100;

cout<<"Local g = "<