When the Cylinders Are Deactivated on a Displacement on Demand

When the cylinders are deactivated on a displacement on demand system, _____.

A) half of the cylinders continue to fire normally
B) oil pressure to the hydraulic lifters is increased, pumping up the lifters
C) the intake and exhaust valves of the deactivated cylinders are held open
D) the injectors continue to fire, but no fuel flows into the combustion chamber

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