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An abstract class is which of the following?

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An abstract class is which of the following?
« on: April 29, 2016, 12:21:37 PM »
Question: An abstract class is which of the following?


Options are:

A.    A class that has direct instances, but whose descendants may have direct instances.
B.    A class that has no direct instances, but whose descendants may have direct instances.
C.    A class that has direct instances, but whose descendants may not have direct instances.
D.    A class that has no direct instances, but whose descendants may not have direct instances


Correct answer is:

B.    A class that has no direct instances, but whose descendants may have direct instances.