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Discussion

When the minimum and maximum number of instances of an entity is one, you know which of the following?

  • A.Mandatory one
  • B.Optional one
  • C.Mandatory many
  • D.
    Cannot tell

Answer: A

Correct answer: Mandatory one

The two figures answer two different questions. The minimum says whether participation is required: one means it is, so the relationship is mandatory. The maximum says how many are permitted: one means at most a single instance. Together they give mandatory one.

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