Technician A says that top dead center (TDC) is simply the point at which a piston stops during its upward travel. Technician B says that piston TDC is the exact midpoint that occurs between the completion of an upstroke and the beginning of a downstroke. 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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