Which set of ordered pairs does notrepresent a function?
○ {(1,8), (5,0), (2,0), (−8,4)}
○ {(9, -3), (9,5), (3, 7), (−2, 1)}
O {(-7,3), (8,8), (4,8), (9, 1)}
○ {(8,-4), (6, 8), (9,0), (4, 9)}