Helo frds please answer this question

Question

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

FD={P→Q, QR→D,ER.D → P}

Which of the following are the candidate keys?

(a) PF, QF.

(b) PF, QF, RF

(c) PEF, QEF, DEF

(d) PEF, QFR

Answer 1

I Reckon Answer is
(d) PEF, QFR

Answer 2

How bro?

Answer 3

Can u please explain it!😅