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