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

class csharp
{
    public int abc(int a)
    {
        Console.WriteLine("A:Just do it!");
        return 0;
    }
}

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