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Which among the following must be in a base class?

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Which among the following must be in a base class?

(a) Data members

(b) Member functions

(c) Access specifiers

(d) Nothing

I got this question during an internship interview.

Asked question is from Base Class in chapter Classes of Object Oriented Programming

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Right answer is (d) Nothing

Easy explanation - Even a class that doesn’t have any members can be a base class. It is not mandatory to have any member or attribute in base class.

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