Question

Consider the relation R(A,B,C,D,E) which satises the following functional dependencies: AB → C BC → D CD → E DE → A AE → B Which of the following functional dependencies are also guaranteed to be satised by relation R? a) AC → D b) BCD → A c) C → E d) A → C

Answer 1

b) BCD = A
because AB = C and BC = D
therefore BCD = A.