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If F is a set of functional dependencies, then the closure of F is denoted by?

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If F is a set of functional dependencies, then the closure of F is denoted by?

(a) F*

(b) Fo

(c) F+

(d) F

I had been asked this question in an interview for internship.

I'd like to ask this question from Functional-Dependency Theory topic in section Relational Database Design of RDBMS

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Right choice is (c) F+

The best explanation: If F is a set of functional dependencies, then the closure of F is denoted by F+. It is the set of all functional dependencies logically implied by F.

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