says that exhaust gases that are metered into the intake manifold by the EGR valve reduce the amount of ambient air that gets into the cylinders. Technician B says that some engine computers use sensors to determine EGR flow rates, while others assume EGR flow rates by using estimates of EGR flow that are stored in a computer memory. Who is correct?
A. Technician A only
B. Technician B only
C. Both technicians
D. Neither technician