What is the output of this program?#include <iostream> using namespace std; class Example { public: Example(int k) : num_k(k) { } public: int operator()(int k = 0) const { return num_k + k; } operator int () const { return num_k; } private: int num_k; friend int g(const Example&); }; int fun(char Z) { return Z; } int main() { Example fun(6); cout << fun(5); return 0; }

• A. 6
• B. 5
• C. 11
• D. Compilation Error
• E. None of these