Question: Given the following relation R, which attribute is a candidate key of R? A B C D a1 b1 c1 d1 a2 b1 c2 d1

Given the following relation R, which attribute is a candidate key of R?

A B C D
a1 b1 c1 d1
a2 b1 c2 d1
a3 b2 c1 d2
a4 b2 c2 d2

A

B

C

D

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