Discussion
Use of a supertype/subtype relationship is necessary when which of the following exists?
Answer: A
Correct answer: An instance of a subtype participates in a relationship that is unique to that subtype.
A supertype and subtype structure is justified either by attributes that apply only to some instances or by relationships that only some instances participate in. If every instance behaves alike in both respects there is nothing to separate and the subtypes add complexity without meaning.
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