Question: The Relation R(a, b) has no duplicate tuples, although neither a nor b is a key. Relation S(c, d) may have duplicates. Which of the

The Relation R(a, b) has no duplicate tuples, although neither a nor b is a key. Relation S(c, d) may have duplicates. Which of the following quarries is guaranteed to produce no duplicates? SELECT c, d FROMS WHERE (c, d) IN (SELECT a. b FROM R) SELECT b FROM R; SELECT a FROM R WHERE b IN (SELECT c FROMS), SELECT b FROM R WHERE b = a

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