What is abstract class in C++?

1. A.

   Any class in C++ is an abstract class/Class from which any class is derived

2. B.

   Class specifically used as a base class with at least one virtual function

3. C.

   Class specifically used as a base class with at least one pure virtual function

4. D.

   More than one of the other descriptions is correct

5. E.

   None of the other descriptions is correct

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