Polymorphism is one of the important characteristics in Java. On Page 658 the text states: The term polymorphism means the ability to take many forms." In Java, a reference variable is polymorphic because it can reference objects of types different from its own, as long as those types are subclasses of its type. For this discussion, you are asked to:

A. Do research on a design pattern using polymorphism with object oriented programming. B. Briefly describe the design pattern. C. Provide an example of how the design pattern could be used. D. Explain why polymorphism is essential to that design pattern.