Discussion
A supertype/subtype hierarchy has which of the following features?
Answer: B
Correct answer: Attributes are assigned at the highest logical level.
An attribute shared by every subtype belongs at the supertype, where it is held once and inherited by all. Pushing it down to the subtypes duplicates it and invites inconsistency. The rule is a matter of placing each attribute as high as it is true, and no higher.
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