Discussion
It is appropriate to use a supertype/subtype relationship when there are attributes that apply to some of the instances of an entity type.
Answer: A
Correct answer: True
This is one of the two conditions justifying the construct. If an attribute applies to only some instances, holding it on the single entity type means most rows carry a null, and the null has no meaning - it is not unknown but inapplicable. A subtype gives it a proper home.
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