A-2 Keys (10 points)

(i) [5pt] Find all the candidate keys of the Relation R(ABCDE) with FD's:

DC, CE →A, DA, and AE → D

(ii) [5pt] Determine all the candidate and superkeys of the relation R(ABCDEF) with

FD's:

AEF → C, BF→ C, EF→ D, and ACDE - F