Technician A says that a driveshaft with U-joints speeds up and slows down once per rotation. Technician B says that to avoid torsional vibrations, the rear U-joint needs to cancel out the non-uniform rotation of the forward U-joint. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: B
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