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Which of the relations given by the following sets of ordered pairs is not a function?
O {(-4,-2), (-1, -1), (-1, 1), (3, 5), (7, 10)}
O {(-8, 3), (-6, 5), (-4, 2), (-2, 7), (-1,4)}
O {(-6,4), (-3, -2), (0, 5), (1, - 2), (2,3)}
O {(5, 0), (4, 0), (3, 0), (2, 0), (1, 0)}