Which of the following relations is a function?

(A) { (-3, 1), (0, 1), (2, 5) }

(B) { (2, - 3), (2, 0), (2,5) }

(C) { (-2,-2), (0, 0), (0, - 2) }

(D) { (1, - 3), (0, - 1), (3, 2), (1, 0) }

... in which relation in

f ...

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