Which of the following characteristics of the set {(0 , 8), (8 , 0), (1 , 6), (6 , 1), (2 , 4), (4 , 2)} make it a function?
A.
The ordered pairs contain only integers.
B.
The ordered pairs demonstrate a pattern.
C.
The ordered pairs do not repeat any of the x values.
D.
The ordered pairs do not repeat any of the y values.