R (A,B,C,D) is a relation. Which of the following does not have a lossless join dependency preserving BCNF decomposition?

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Q. R (A,B,C,D) is a relation. Which of the following does not have a lossless join dependency preserving BCNF decomposition?

(A) a->b, b->cd
(B) a->b, b->c, c->d
(C) ab->c, c->ad
(D) a->bcd

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✅ Correct Answer: (D) a->bcd

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