Question: Consider the relation schema R(A, B, C, D, E, F) with the functional dependencies K= {ABE, ACF, BEFD}. Which of the following attribute sets is

Consider the relation schema R(A, B, C, D, E, F) with the functional dependencies K= {ABE, ACF, BEFD}. Which of the following attribute sets is a key? Show each step.

ABCE

ABDF

BEF

ACDE

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