Choose the correct way to call subroutine fun() of the sample class?

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

A. -= B. += C. /= D. *=

A. Removes a delegate from the current delegate B. Adds a new delegate to the current delegate C. Invokes all the delegates bound to the current delegate D. Retrieves an array of delegates bound to the current delegate

A. A function that is called when an event is raised B. A function that is called to subscribe to an event C. A function that is called to unsubscribe from an event D. A function that is called to handle an event

A. Func B. Predicate C. Action D. EventHandler