Which of the following is the correct way to call the function abc() of the given class csharp given below? class csharp { public int abc(int a) { Console.WriteLine("A:Just do it!"); return 0; } }

• A. delegate void del(int a); csharp s = new csharp(); del d = new del(ref s.abc); d(10);
• B. csharp s = new csharp(); delegate void d = new del(ref abc); d(10);
• C. delegate int del(int a); del d; csharp s = new csharp(); d = new del(ref s.fun); d(10);
• D. None of the mentioned