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Consider the relation R with the following functional dependencies R ( P , Q , R , D , E , F ) F D

Consider the relation

R

with the following functional dependencies

R (P, Q, R, D, E, F)

F D = {P Q, Q R D, E R, D P}

Which of the following are the candidate keys?

PEF, QEF, DEF

P F, Q F .

PEF, QFR

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