What is the output of following program.


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What is the output of following program.

#include 
 using namespace std;
  
 class B;
 class A {
     int a;
 public:
     A():a(0) { }
     void show(A& x, B& y);
 };
  
 class B {
 private:
     int b;
 public:
     B():b(0) { }
     friend void A::show(A& x, B& y);
 };
  
 void A::show(A& x, B& y) {
     x.a = 10;
     cout << "A::a=" << x.a << " B::b=" << y.b;
 }
  
 int main() {
     A a;
     B b;
     a.show(a,b);
     return 0;
 }

A. A::a=10 B::b=0
B. Compiler Error
C. A::a=0 B::b=0
D. None of the above