What is the output of this program?_x005F_x000D_ #include        using namespace std;       void fun(int x, int y)       {           x = 20;           y = 10;       }       int main()       {           int x = 10;           fun(x, x);           cout << x;           return 0;       }

• A. 10
• B. 20
• C. compile time error
• D. none of these