Graph the relation {(5, 0), (0, 5), (5, 1), (1, 5)}. Is it a function? Why or why not?
 A. No, it does not pass the horizontal-line test.
 B. Yes, it passes the vertical-line test.
 C. Yes, it passes the horizontal-line test.
 D.No, it does not pass the vertical-line test.