In the following C# code, which statements are perfectly valid?

public class Csharp
{
    public void subject<S>(S arg)
    {
        Console.WriteLine(arg);
    }
}
class Program
{
    static Void Main(string[] args)
    {
        Csharp c = new Csharp();
        c.subject("hi");
        c.subject(20);
    }
}

In C#, which keyword is used to remove an event handler from an event?

A. -=

B. +=

C. /=

D. *=

What is the purpose of the GetInvocationList() method associated with delegates in C#?

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

What is a callback function in the context of delegates and events in C#?

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

In C#, which delegate type is used to represent methods that do not return a value and do not take any parameters?

A. Func

B. Predicate

C. Action

D. EventHandler