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A rectangle represents which of the following in an EER?

  • A.Attribute
  • B.
    Entity
  • C.Optional One
  • D.Relationship

Answer: C

Correct answer: Entity

The rectangle is the entity symbol in an entity-relationship diagram, as the oval is the attribute symbol and the diamond the relationship symbol. Optional participation is shown by cardinality notation on the relationship line rather than by any shape of its own.

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