The position of a body moving along the s-axis is given by s=t^3−12t^2+36t, with s in meters and t in seconds. (b) Find the body's velocity each time the acceleration is zero. If there is more than one answer, enter a comma separated list. If there are no answers, enter NONE. Velocity=____________m/s A. 6, 12 B. -6, 12 C. -6, 6 D. NONE