When the Cylinders Are Deactivated on a Displacement on Demand

Multiple Choice

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) both the intake and exhaust valves of the deactivated cylinders are held open
D) the injectors continue to fire, but because the manifold vacuum is so low, no fuel flows into the combustion chamber