What is the output of following program?


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What is the output of following program?

#include 
 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. Compiler Error: Cannot access static a
B. Compiler Error: multiple functions with same name get()
C. Compiler Error: Undefined reference B::a
D. 0