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If an entity can belong to only one lower level entity then the constraint is

  • A.disjoint
  • B.partial
  • C.overlapping
  • D.single

Answer: B

Correct answer: disjoint

If an entity may belong to at most one of the lower-level sets, the specialisation is disjoint; if it may belong to several, it is overlapping. Partial and total answer a different question - whether every higher-level entity must belong to some lower-level set at all.

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