Question: Suppose r(A,B) and s(C,D) are compatible relations. Consider any valid instances of these relations. Which of the following statements is CORRECT about the output of

Suppose r(A,B) and s(C,D) are compatible relations. Consider any valid instances

Suppose r(A,B) and s(C,D) are compatible relations. Consider any valid instances of these relations. Which of the following statements is CORRECT about the output of the query below? SELECTFROMr,sWHEREA=CandB=D; None of the other statements is correct. The query returns a subset of the tuples that belong to both relations. x The query returns tuples that belong to both relations when null values are not allowed. The query returns those tuples that belong to both relations

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