Please tell me all that apply

Which of the following relations or graphs are functions? 0 { (2, 7), (3, -1), (-5, 3), (3, 7) } Of(-6, -3), (2, 0), (9, 3), (-3, -1), (2, 1) } O {(4, 1), (1, 3), (3, 3), (5, 3), (2, 4) } Input, x -6 -1 4 8 Output, y 10 9 8 6 Of(-2, 0), (-1, 1) , (0, 2) , (1, 3), (2, 4) } 5+ 4 3 - 1 2 3 4 5 6 x