11. Which of the given set of ordered pairs
illustrates a function?
A. S={(0, 0), (1, -1), (1, 1), (2, 2)}
B. S={(-2,7), (-1,6 ). (1,5), (0,4)}
C. S={ (-2, 2).(-1, 1), (1, 1), (-2,-2)}
D. S={(0, 2), (0, 3), (0,4),(0,5)}​