Q.

What is an abstract class?

A. a class that has direct instances, but whose descendants may have direct instances.
B. a class that has direct instances, but whose descendants may not have direct instances.
C. a class that has no direct instances, but whose descendants may have direct instances.
Answer» C. a class that has no direct instances, but whose descendants may have direct instances.
Explanation: an abstract type is a type in a nominative type system which cannot be instantiated directly.
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