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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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