Predict the output of following program.


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Predict the output of following program.

#include
 using namespace std;
  
 class Test
 {
 private:
     static int count;
 public:
     Test& fun(); 
 };
  
 int Test::count = 0;
  
 Test& Test::fun()
 {
     Test::count++;
     cout << Test::count << " ";
     return *this;
 }
  
 int main()
 {
     Test t;
     t.fun().fun().fun().fun();
     return 0;
 }

A. 1 1 1 1
B. 1 2 3 4
C. 4 4 4 4
D. compiler error.