Modify Program 8.1 to add a new class called ClassB2 that, like ClassB, is a subclass of ClassA. What can you say about the relationship between ClassB and ClassB2? Identify the hierarchical...

Modify Program 8.1 to add a new class called ClassB2 that, like ClassB, is a subclass of ClassA. What can you say about the relationship between ClassB and ClassB2? Identify the hierarchical relationship between the NSObject class, ClassA, ClassB, and ClassB2. What is the superclass of ClassB? What is the superclass of ClassB2? How many subclasses can a class have, and how many superclasses can it have?