(A) R has no duplicates and S is non-empty
(B) R and S has no duplicates
(C) S has no duplicates and R is non-empty
(D) R and S has same numbers of tuples
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(A) R has no duplicates and S is non-empty
(B) R and S has no duplicates
(C) S has no duplicates and R is non-empty
(D) R and S has same numbers of tuples