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If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then

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If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then

(a) B→A holds

(b) A→B holds

(c) AB→C holds

(d) None of the mentioned

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This question is from Functional-Dependency Theory in section Relational Database Design of RDBMS

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Right option is (b) A→B holds

Explanation: If a functional dependency is reflexive, B is a subset of A and A is the set of attributes, then A→B holds. This is called the reflexivity rule of Armstrong’s axioms.

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