Modify the Rectangle and XYPoint classes defined in Chapter 8 to conform to the protocol.Add a copyWithZone: method to both classes. Make sure that the Rectangle copies its XYPoint member origin using...

Modify the Rectangle and XYPoint classes defined in Chapter 8 to conform to the protocol.Add a copyWithZone: method to both classes. Make sure that the Rectangle copies its XYPoint member origin using the XYPoint’s copy method. Does it make sense to implement both mutable and immutable copies for these classes? Explain.