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2 Answers

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A trivial functional dependency is a database dependency that occurs when describing a functional dependency of an attribute or of a collection of attributes that includes the original attribute.

So A is correct.

Ref: https://www.lifewire.com/trivial-functional-dependency-1019761

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Axiom of reflexivity – If {\displaystyle A} is a set of attributes and {\displaystyle B} is subset of {\displaystyle C}, then {\displaystyle C} holds {\displaystyle B}. If {\displaystyle B\subseteq A} then {\displaystyle A\to B} This property is trivial property

 

so answer A is correct option

Answer:

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