Choose The Correct Way To Call Subroutine Fun Of The Sample #608

 class a { public void x(int p, double k) { Console.WriteLine("k : csharp!"); } } 

 delegate void del(int i); x s = new x(); del d = new del(ref s.x); d(8, 2.2f); 

 delegate void del(int p,  double k); del d; x s = new x(); d = new del(ref s.x); d(8, 2.2f); 

 x s = new x(); delegate void d = new del(ref x); d(8, 2.2f);