Which graph is an example of a cubic function? a. On a coordinate plane, a parabola is shown.
b. On a coordinate plane, a curve approaches x = negative 2 in quadrant 3, increases to a put of inflection at (0, 1), and then increases again and approaches x = 2.
c. On a coordinate plane, a straight line has a positive slope.
d. On a coordinate plane, a function has a line with positive slope that intersects with a line with a negative slope.