Which set of points represents a function? { ( 5 , 0 ) , ( 9 , 8 ) , ( 2 , 5 ) , ( 1 , 4 ) , ( 1 , 1 ) } {(5,0),(9,8),(2,5),(1,4),(1,1)} { ( 9 , 9 ) , ( 9 , 7 ) , ( 8 , 1 ) , ( 5 , 8 ) , ( 1 , 4 ) } {(9,9),(9,7),(8,1),(5,8),(1,4)} { ( 2 , 5 ) , ( 4 , 5 ) , ( 7 , 1 ) , ( 0 , 8 ) , ( 6 , 4 ) } {(2,5),(4,5),(7,1),(0,8),(6,4)} { ( 9 , 3 ) , ( 9 , 2 ) , ( 1 , 1 ) , ( 3 , 6 ) , ( 6 , 7 ) } {(9,3),(9,2),(1,1),(3,6),(6,7)}