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Which of the following set of ordered pairs is a function?

a, {(0, -2), (1, 1), (3,1), (2, 4}

b, {(0, 8), (-1, 2), (0, 0), (1, 2)}

c, {(-2 2), (-1, 1), (0, 0), (-1, -2)}

d, {(3, 3), (0, 0), (-3, -3), (0, 3)}​