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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: A

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