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A supertype/subtype hierarchy has which of the following features?

  • A.Subtypes at the lower lever in the hierarchy inherit attributes only from their immediate supertype.
  • B.Attributes are assigned at the highest logical level.
  • C.Subtypes at the higher lever in the hierarchy inherit attributes only from their immediate subtype.
  • D.Attributes are assigned at the lowest logical level.

Answer: B

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