Which of the followings can possibly be a canonical cover Fc of a set F of functional dependencies? (The actual set F or the actual relation R is not required to answer this question.) (a) {A → B,B → D,B → C} (b) {A → D,AB → C,D → B} (c) {A → B,AB → B,C → D} (d) {A → C,D → B,AB → C} (e) none of the above

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