Which set of ordered pairs does not represent a function?
{(0, -4), (8,5), (-5,6), (6,5)}
○ {(0, -1), (-4, 0), (-2,-1), (7,-7)}
{(0, 3), (-3,6), (-7,3), (9,-5)}
{(8,-2), (-2,-3), (6), (-2,-6)}