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How many abstract classes can a single program contain?

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in Object Oriented Programming by (128k points)
How many abstract classes can a single program contain?

(a) At most 1

(b) At least 1

(c) At most 127

(d) As many as required

The question was posed to me in class test.

Query is from Abstract Class in division Classes of Object Oriented Programming

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The correct answer is (d) As many as required

Easiest explanation - There is no restriction on the number of abstract classes that can be defined inside a single program. The programs can use as many abstract classes as required. But the functions with no body must be implemented.

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