A race car driver completes one lap on the track shown here with a constant speed of v$.$ Which of the following best describes the acceleration$($s$)$ of the car? An irregularly$-$shaped racetrack is shown. The left side has an outward curve that traces the left and bottom halves of the circumference of a circle with radius R$.$ Point A is on the leftmost edge of the circle. The top side of the track is horizontal. The right side of the track has a curve that traces the right half of a circle with radius r$,$ where r is smaller than R$.$ Point C is at the rightmost point on the curve. Underneath that curve the track curves inward, connecting back to the curve with point A$,$ tracing the top left third of the circumference of a circle with radius r$.$ Point B is at the innermost point of the curve. $($A$)$ The tangential acceleration remains zero throughout the lap. $($B$)$ The total magnitude of acceleration at B is different than that at C$.($C$)$ The centripetal acceleration at point A is greater than the centripetal acceleration at point B$.($D$)$ The tangential acceleration at point A is less than the tangential acceleration at point C$.$