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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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