Quiz 15

One of the questions in the quiz 15 has an incorrect correct (heh) answer, in my opinion. The question in question (heh heh) is:

If we make a method abstract, which is most true about the implementation of that method? You may need to do some of your own side-study.

To which the accepted answer is, that the derived classes have to provide the abstract method implementation.

That is correct only, if the derived classes are concrete. Derived abstract classes do not have to provide implementations.

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