Which of the following statements about “total specialization” constraint is…

Coal India Management Trainee CBT · 2017 · 2017 System · Paper II · Domain Knowledge

1. A.

   Every entity in the subclass must be a member of the superclass.

2. B.

   Every entity in the superclass must be a member of at least one subclass in the specialization.

3. C.

   At least one entity in the superclass must be a member of at least one subclass in the specialization.

4. D.

   Every entity in the superclass must be a member of all subclasses in the specialization.

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