9.
Is the relation a function? Why or why not?

{(3, –1), (3, 0), (–3, 4), (3, 8)}


A. No; the relation passes the vertical-line test.

B. No; three range values exist for domain value 3.

C. Yes; three range values exist for domain value 3.

D. Yes; only one range value exists for each domain value.