A steel ball is rolling along a 20-inch long straight track so that its distance from the midpoint of the track (which is 10 inches from either end) is d = 3sin(t) inches after t seconds have passed. (Think of the track as aligned from left to right. Positive distances mean the ball is to the right of the center; negative distances mean it is to the left.)What is happening when the velocity is positive? (can be more than one answer) A.The ball is moving to the left B.The ball is moving to the right C.The ball is slowing down D.The ball is speeding up