Question: If there is a functional dependency between attributes X and Y in a relation R , under what circumstances would attribute X be considered a

If there is a functional dependency between attributes X and Y in a relation R, under what circumstances would attribute X be considered a candidate key?
Question 1 options:
If attribute X is the first listed attribute in relation R
If a constraint on R states that X determines more than one value of Y
If attribute X = attribute Y
If a constraint on R states that there cannot be more than one tuple with a given X-value in any relation instance r.

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