Which of the Following Is False About Interfaces

Multiple Choice

Which of the following is false about interfaces

A) An interface describes a set of methods that can be called on an object, providing a default implementation for the methods.
B) An interface describes a set of methods that can be called on an object, without providing concrete implementation for the methods.
C) Interfaces are useful when attempting to assign common functionality to possibly unrelated classes.
D) Once a class implements an interface, all objects of that class have an is-a relationship with the interface type.