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How many classes must be there to implement hierarchical inheritance?

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How many classes must be there to implement hierarchical inheritance?

(a) Exactly 3

(b) At least 3

(c) At most 3

(d) At least 1

I had been asked this question by my school principal while I was bunking the class.

My question comes from Hierarchical Inheritance topic in portion Inheritance & its Types of Object Oriented Programming

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Right choice is (b) At least 3

The best I can explain: At least 3 classes must be there. Two derived classes and one base class. This lets us implement two classes that have common characteristics from base class.

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