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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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