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If a base class is being derived by two other classes, which inheritance will that be called?

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If a base class is being derived by two other classes, which inheritance will that be called?

(a) Single

(b) Multiple

(c) Multi-level

(d) Hierarchical

I had been asked this question during an online exam.

I would like to ask this question from Base Class topic in section Classes of Object Oriented Programming

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The correct answer is (d) Hierarchical

For explanation: When more than one classes are being derived from a single parent class, the inheritance is known as hierarchical inheritance. This is usually useful when the base class is higher abstraction of its derived classes.

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