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 unique to that subtype
B. An instance of a subtype participates in a relationship that is the same as the other subtypes
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
Answer» B. An instance of a subtype participates in a relationship that is the same as the other subtypes


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