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If ___, then A -> B has trivial functional dependency

7. If ___, then A -> B has trivial functional dependency.

1. B is a subset of A
2. A is a subset of B
3. A is a subset of A'
4. B is a subset of B'

Answer: A) B is a subset of A

Explanation:

If B is a subset of A, then A -> B has trivial functional dependency.