Which of the following statements is not true? Subclasses may add operations to the protocol inherited from their superclass(es). Subclasses may override operations inherited from their superclass(es). Subclasses may add attributes to the set of attributes inherited from their superclass(es). Subclasses may override attributes inherited from their superclass(es). There is a class, Shape, with subclasses Square, Circle and Triangle. All of these classes have the operation computeArea(). The behavior is obviously different in each of the classes. A variable of type Shape may contain a reference to an object instance of any of these classes. If the operation computerArea() is invoked through this variable, the behavior that is executed depends on the class of the object instance that is referenced by the variable. What object-oriented principle is this? Isomorphism Polymorphism Homomorphism Anthropomorphism One thing about an engineering discipline is that it is based on scientific principles. Which of the following is not one of the underpinnings of software engineering? Psychology Physics Discrete Mathematics Computer Science