1. Technician A says that primary vibration is created by slight differences in the inertia of the pistons between top dead center and bottom dead center. Technician B says that secondary vibration is a strong low-frequency vibration caused by the movement of the piston traveling up and down the cylinder. Who is correct?
A. Technicians
B. Neither Technician Anor B
C. Both Technicians A and B
D. Technician