Which statement is true when a base class has protected instance variables
A) A derived class object can assign an invalid value to the base class's instance variables, thus leaving the object in an inconsistent state.
B) Derived class methods are more likely to be written so that they depend on the base class's data implementation.
C) We may need to modify all the derived classes of the base class if the base class implementation changes.
D) All of the above.

Question

Quizplus · Accepted Answer

All the statements are true regarding the use of protected instance variables in a base class. Protected instance variables are accessible within the class itself, its subclasses, and classes in the same package. This accessibility allows derived class objects to potentially assign invalid values to these variables (A), making the object inconsistent. It also encourages tight coupling between the base and derived classes because derived classes can directly access and depend on the base class's data implementation (B). Consequently, if the implementation of the base class changes, it might necessitate modifications in all derived classes to accommodate these changes (C).

Which Statement Is True When a Base Class Has Protected