Question: 1 . What is an abstract class? a ) A class that has direct instances, but whose descendants may have direct instances b ) A

1. 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
d) All of the mentioned

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