Two Technicians Are Discussing Oil Filters

Multiple Choice

Two technicians are discussing oil filters. Technician A says the oil filter has an anti-drain-back valve that prevents the oil in the filter and engine oil passages from returning to the sump when the engine is shut down. Technician B says the oil filter has a bypass valve that in the event the filter becomes plugged, oil can flow directly to the bearings. Who is correct?

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