Given R(x, y, z, w) with F = {x → y, z → w}, where all attributes are atomic: A. R is in First Normal Form. B. R is in Second Normal Form. C. The primary key of R is xz.
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Correct answer: C. A and C only
Explanation
x and z appear on no right side, and xz determines everything, so xz is the key. Atomic values give 1NF. x → y is a partial dependency, so R is not in 2NF. A and C.
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