Which of the following statements best describes the graph of x + y = 2?

a. it is a line which intersects the x-axis at (2, 2).
b. it is a line which intersects the y-axis at (2, 2).
c. it is a line joining the points whose x- and y-coordinates add up to 2.
d. it is a line joining the points whose x- and y-coordinates add up to 4.