All of the following statements about the air injection system are true EXCEPT: ___________
a. a diverter valve, or a similar type of device, prevents a backfire during deceleration.
b. a one-way check valve prevents exhaust from backing up into the hoses and pump.
c. a high-pressure vane-type pump driven by a crankshaft belt provides air.
d. computer-controlled three-way catalyst systems include an air switching valve that moves the injected air into the exhaust manifold or into part of the catalytic converter.