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Que. Given relations r(w, x) and s(y, z), the result of

SELECT DISTINCT w, x
FROM r, s

is guaranteed to be same as r, provided
a. r has no duplicates and s is non-empty
b. r and s have no duplicates
c. s has no duplicates and r is non-empty
d. r and s have the same number of tuples
Answer:r has no duplicates and s is non-empty
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