Which set of ordered pairs represents a function?

1) {1,9), (-5,-5), (1,-8), (-9,5) }

2) { (-3,9), (3,-4), (2,9), (3,4) }

3) { (3,-3), (-7,-5), (5,-5), (-1,2)

4) { (3,6), (2,1), (-8,4), (2,0) }

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