ion For class Cthat extends class B, is t ossible to avoid calling a constructor of B in a constructor of C? a) Yes b) No 19) A default (no-argument) constructor for a class: a) Is provided for you if you do not specify one b) Is called a is specif ledtomatically by subclass constructors if no other superclass constructor c) Is no longer automatically provided if you specify at least one constructor d) All of the above 20) Which design pattern is structural? a) Decorator b) Factory c) Singleton d) Adapter e) Observer 21) Which design pattern is creational? a) Decorator b) Factory c) Singleton d) Adapter e) Observer 22) Using design patterns allow you to re-use: a) Code b) Classes c) Variables d) Designs e) Generic types 23) Exception propagation refers to a) Excessive publicity to promote awareness of exceptions b) Failure to account for exceptions, leading to a program crash c) Including a try/catch block but not including a finally block d) Control flow change in order to locate a suitable handler e) None of the above a) Must be caught or declared by the method that might encounter the b) Must be subclasses as part of your own exception definition c) Can be extended by their methods cannot be overridden 24) Checked exceptions d) Are all exceptions except Throwable e) None of the above