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Que. Consider the relation schema R = (A,B,C,D,E,F) on which the following functional dependencies hold:

A → B
B, C → D
E → C
D → A

What are the candidate keys of R?
a. AE and BE
b. AE, BE and DE
c. AEF, BEF and BCF
d. AEF, BEF and DEF
Answer: AEF, BEF and DEF
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