Multiple Choice
What is the domain of the function below?

{(0, 2), (3, 1), (5,2), (8,4)}?

A. {1, 2, 4}
B. {0, 3, 5, 8}
C. {0, 1, 2, 3, 4, 5, 8}
D. {(0, 2), (3, 1), (5,2), (8,4)}