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      Question

      What is a primary key in the context of the ER

      model?
      A A key attribute that uniquely identifies an entity Correct Answer Incorrect Answer
      B A key attribute that is used for data encryption Correct Answer Incorrect Answer
      C A key attribute that is derived from other attributes Correct Answer Incorrect Answer
      D A key attribute that is optional in the database Correct Answer Incorrect Answer
      E None of the mentioned Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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