Which of the following is the correct way to call the subroutine function abc() of the given class in the following C# code?

class csharp
{
    void abc()
    {
        console.writeline("A:Just do it!");
    }
}

A.

csharp c = new csharp();
delegate void d = new del(ref abc);
d();

B.

delegate void del();
del d;
csharp s = new csharp();
d = new del(ref s.abc);
d();

C.

   csharp s = new csharp();
   delegate void del = new delegate(ref abc);
   del();

D. None of the mentioned

Answer: Option B