#include <iostream>class A { private: int a; public: A() { a = 0; } friend class B; // Friend Class }; class B { private: int b; public: void showA(A& x) { std::cout << ""A::a="" << x.a; } }; int main() { A a; B b; b.showA(a); }6.What will be output for the following code?

• A. 1
• B. 2
• C. 3
• D. 4