Given the relation R(ABCDE) with the following FD's:

Given the relation R(ABCDE) with the following FD's:

Given the relation R(ABCDE) with the following FD's: 

D -> C,
CE ->A,
D ->A, and
AE ->D
Which of the following attribute set is a key?



a. ABCDE
b. CDE
c. ABE
d. BD



Answer: C


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