Discussion
If a table has been normalized so that all determinants are candidate keys, then that table is in:
Answer: D
Correct answer: BCNF.
This is the definition of Boyce-Codd Normal Form: every determinant - every left-hand side of a functional dependency - must be a candidate key. A determinant that is not a key allows the same fact to be repeated across many rows, which is precisely what produces update anomalies. Note the direction: all determinants must be candidate keys, not the reverse.
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