Which of the following is correct?
(a)Function dependencies are not associated with relations; they are based on the semantics of information that we are dealing with
(b)If a relation has no redundant information its attributes must not have any function dependencies
(c)Functional dependencies may be determined if we are given several instances of a relation
(d)The FDs that hold for attributes of a relation need not be satisfied at all times
(e)BCNF is a fourth normal form.
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