Database - Object-Oriented Data Modeling - Discussion

An abstract class is which of the following?

[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

Answer: Option B

Explanation:

No answer description available for this question.

Kadam Shailesh Ashok said: (Oct 3, 2011)
What is mining of the abstract class?

Kiran Kumar said: (May 17, 2016)
Interface- 100% not implemented methods. Abstract class - 0 to 100% implemented methods. Concrete class - 100% implemented methods.

Ambachew Assefa said: (Jul 23, 2019)
Please explain it in detail.

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