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A functional dependency of the form $x\to y$ is trivial if

  1. $y\subseteq x$
  2. $y\subset x$
  3. $x\subseteq y$
  4. $x\subset y\:\text{and}\:y\subset x$
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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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