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Which of the following statement is correct about the program given below?

#include 
 class Gate
 {   
      int x, y;  
      public:   
      Gate(int x, int y)     
      {         
          this->x = x;     
          this->y = y;     
      }
      void Display()    
     {         
         cout" " int main() 
  {
      int x = 50;  
      int &y = x ;   
      Bix b(y, x);     
      return 0;
  }