What does the event keyword add when applied to a delegate field in a C# class?
Correct answer C. Outside code can only subscribe with += and unsubscribe with -=, not invoke or replace it
Explanation
Declaring public event EventHandler Clicked; wraps the delegate so that only the declaring class can raise it or assign it directly. External subscribers can only add and remove handlers with += and -=. With a plain public delegate field, any code could invoke it or wipe out other subscribers with =. The event is typically raised with Clicked?.Invoke(this, EventArgs.Empty).
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