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Suppose relation R(A,B) has the following tuples: A B 1 2 1 5 5 6 and relation S(B,C,D) has the following tuples: B C D 2 4 6 6 6 8 5 7 9 Compute the natural join of R and S. Which of the following tuples is in the result? Assume each tuple has schema (A,B,C,D).