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database the enhanced e r model and business rules
1. A supertype/subtype hierarchy has which of the following features?
(A): Attributes are assigned at the highest logical level.
(B): Attributes are assigned at the lowest logical level.
(C): Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
(D): Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.
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