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database the enhanced e r model and business rules
1. Use of a supertype/subtype relationship is necessary when which of the following exists?
(A): An instance of a subtype participates in a relationship that is the same as the other subtypes.
(B): An instance of a subtype participates in a relationship that is unique to that subtype.
(C): Attributes apply to all of the instances of an entity type.
(D): No attributes apply to any of the instances of an entity type.
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