Q2: State whether each of the statements that follows is true or false . If false , explain why. a. All methods in an abstract class must be declared as abstract methods. b. Invoking a subclass-only method through a subclass variable is not allowed. c. If a superclass declares an abstract method, a subclass must implement that method. d. An object of a class that implements an interface may be thought of as an object of thatinterface type.