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    Question

    The join operation can be defined as

    A a cartesian product of two relations followed by a selection Correct Answer Incorrect Answer
    B a cartesian product of two relations Correct Answer Incorrect Answer
    C a union of two relations followed by cartesian product of the two relations Correct Answer Incorrect Answer
    D a union of two relations Correct Answer Incorrect Answer

    Solution

    a cartesian product of two relations followed by a selection

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