The following is a list of four ordered pairs that
represent a relation of points (x, y) on a coordinate
plane.
(n, 3), (n, 6), (n, 9), (n, 12)
The domain of the relation consists of a number n,
which is a constant. Which of these statements
about the relation is true?
A. The relation is a function.
B. The relation is not a function.
C. The relation has a constant value for y.
D. The graph of the relation is a horizontal line.