Which set of ordered pairs represents a function?
A) { (-4,-6) (-4,2) (4,-1) (2,9)}
OB) { (-5,2) (-9,-2) (-5,6) (0,2)}
C) {(6,1) (10,8) (8,-5) (0,-9) }
OD) {(1,0) (-3,-6) (6,3) (-3,0) }