Describe how you would determine whether a triangle is a right triangle given its coordinates.
A. You could find out whether the slopes of any two sides have a product of −1. B. You could find out whether any two sides have the same slope. C. You could find out whether one side is parallel to an axis, or perpendicular to an axis. D. You could find out whether one side has a slope of 0, and another side has a slope of either 1 or −1.