Discussion
Most of the time, modification anomalies are serious enough that tables should be normalized into:
Answer: D
Correct answer: BCNF.
Boyce-Codd Normal Form requires every determinant to be a candidate key, and a table satisfying it is free of the anomalies that arise from functional dependencies. Third normal form leaves some cases unhandled, which is why BCNF rather than 3NF is the practical target. Beyond it, 4NF deals with multivalued dependencies, which are a separate matter.
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