What is the purpose of an abstract method in an abstract class or interface?

A. A contract specifying a set of methods that a class must implement B. A class that cannot be instantiated C. A class that contains only static methods D. A subclass of the Object class

A. Interfaces cannot be implemented by classes B. Only abstract classes can implement interfaces C. No, a class can only implement one interface D. Yes, a class can implement multiple interfaces

A. class B. abstract C. interface D. extends

A. To declare abstract methods B. To provide a base class with common methods and fields C. To make a class final D. None of These