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Which relation is a function?

Select all that apply.
Responses

{(−1, 2), (−2,2), (−3, 2), (−4,2)}

{(−1, 2), (−2,2), (−3, 2), (−4,2)}
{(2, 1), (2,3), (−2, 5), (−2,7)}
{(2, 1), (2,3), (−2, 5), (−2,7)}
{(2, 2), (3,3), (4, 4), (5,5)}
{(2, 2), (3,3), (4, 4), (5,5)}
{(2, 1), (−2,1), (3, 2), (4,2)}
{(2, 1), (−2,1), (3, 2), (4,2)}
{(2, 1), (2,3), (3, 4), (4,5)}