Which of the following is not a condition for X→ Y in Boyce codd normal form?

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answerhappygod
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Which of the following is not a condition for X→ Y in Boyce codd normal form?

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a) X → Y is trivial
b) X is the superkey for the relational schema R
c) Y is the superkey for the relational schema R
d) All of the mentioned
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