Using polymorphism, existing operations on a base class can be left alone, without the need to retest and reverify them, while they are extended to a derived class.

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Quizplus · Accepted Answer

Polymorphism allows derived classes to use the interface of their base class while providing their own implementation. This means that existing operations on the base class remain unchanged and do not require retesting when they are extended to a derived class, as the interface and expected behavior are maintained.

Using Polymorphism, Existing Operations on a Base Class Can Be