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If attributes A and B determine attribute C, then it is also true that:

  • A.A → C.
  • B.B → C.
  • C.(A,B) is a composite determinant.
  • D.C is a determinant.

Answer: C

Correct answer: (A,B) is a composite determinant.

When two attributes together determine a third, the pair forms a composite determinant, and the dependency is on the pair as a whole. It does not follow that either attribute determines C on its own - if it did, the other would be redundant and the determinant would not be minimal. Nor does the dependency work in reverse.

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