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Abstract classes a) must explicitly include a pure virtual function. b) can have objects instantiated from...

Abstract classes

a) must explicitly include a pure virtual function.

b) can have objects instantiated from them if the proper permissions are set.

c) cannot have abstract derived classes.

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Answer #1 
a) must explicitly include a pure virtual function.
True. because for a class to be abstract, it must include a pure virtual function

b) can have objects instantiated from them if the proper permissions are set.
False.  we can instance objects of Abstract classes.

c) cannot have abstract derived classes.
False.  An abstract class can have abstract derived classes.

Answer: A.  must explicitly include a pure virtual function.
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