Technician a Says the AIRB Valve Directs Secondary Air Either

Technician A says the AIRB valve directs secondary air either to the intake manifold or to the catalytic converter. Technician B says with the engine at normal operating temperature, the AIR system sometimes goes back into upstream mode with the engine idling. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B

Correct Answer:

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