Which of the following correctly describes the graph of the equation x=−4 on the Cartesian plane?
a) A slant line making 45∘ with the x-axis
b) A horizontal line parallel to the x-axis passing through (0,−4)
c) A vertical line parallel to the y-axis passing through (−4,0)
d) A slant line descending from left to right with slope −4 and passing through the origin