is possible to make ‘promote’ function as virtual? Can this class be made abstract? Justify your answer.  Should we define a destructor of an abstract class? Justify your answer with proper reasoning.  Why was there a need to define virtual functions? Explain an issue/trouble faced in inheritance that is only resolved by making functions virtual.

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A: For Useful to use extension methods

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A:

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A: The code for the the above program, and the output screenshot is:

Q: Is there any difference between abstract and concrete class

A: Given: Is there any difference between abstract and concrete classes?

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