Two Technicians Are Discussing Flat Tappet Camshafts

Multiple Choice

Two technicians are discussing flat tappet camshafts. Technician A says that a valve lifter must be perfectly centered above its corresponding cam lobe. Technician B says a pushrod engine cam lobe is slightly tapered across its face. Who is right?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B