Inheritance provides the benefits of __________. A. shared interfaces B. run-time polymorphism C. less redundant information D. faster compilation Choose the Correct answer from the options given below:
A, B, C only
Inheritance lets a derived class reuse and extend the members of a base class. Its benefits are what the design gains from this reuse; how quickly the program compiles is not one of them.
A — Shared interfaces: every derived class exposes the interface declared by the base class, so client code can treat all of them uniformly. This is a benefit.
B — Run-time polymorphism: a base-class reference or pointer can refer to any derived object, and the overriding method of the actual object is used. Inheritance is what makes this substitutability possible, so it is a benefit.
C — Less redundant information: common data and code are written once in the base class instead of being repeated in every subclass. This is a benefit.
D — Faster compilation: inheritance does not make a program compile faster. The compiler must still process the base-class definitions for every derived class and, for virtual functions, build the virtual-function tables, so inheritance adds compile-time work rather than saving it. It is not a benefit of inheritance.
Every combination that includes faster compilation is therefore wrong, and the only combination of the three genuine benefits is shared interfaces, run-time polymorphism and less redundant information.
A, B, C only option is correct.
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