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A rectangle represents which of the following in an ERD?

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

Answer: B

Correct answer: Entity

The rectangle is the entity symbol. The three shapes to know are rectangle for entity, oval for attribute and diamond for relationship; cardinality and optionality are shown by marks on the relationship lines rather than by shapes of their own.

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