Which statement is a correct interpretation of the vertical line test?

a) if only one vertical line intersects the graph at exactly one point, the graph represents a function.

b) if only one vertical line intersects the graph at exactly one point, the graph does not represent a function.

c) if any vertical line can intersect the graph at more than one point, the graph represents a function.

d) if any vertical line can intersect the graph at more than one point, the graph does not represent a function.