Please help!!

The function below contains ordered pairs of the form (x,y)

F = (6,8), (-4,3), (5,1)

What is the domain of the function?

A) { -4, 1, 3, 5, 6, 8 }
B) { 1, 3, 9 }
C) { -4, 5, 5 }
D) { 5, 6 }​