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Suppose relation R(A,B,C) has the following tuples: A B C 1 2 3 4 7 8 4 5 6 2 5 3 1 2 6 and relation S(A,B,C) has the following tuples: A B C 2 5 3 6 1 4 4 5 6 1 2 3 Compute (R - S) union (S - R), often called the "symmetric difference" of R and S. Which of the following tuples is in the result?