Predict the output of following C++ program.#include <iostream>using namespace std;class A{private:int x;public:A(int _x) { x = _x; }int get() { return x; }};class B{static A a;public:static int get(){ return a.get(); }};int main(void){B b;cout << b.get();return 0;}(A) 0(B) Linker Error: Undefined reference B::a(C) Linker Error: Cannot access static a(D) Linker Error: multiple functions with same name get()