When Adjusting the Valve Clearances on the Engine, Technician a Says

When adjusting the valve clearances on the engine, technician A says the valves are closed when the valve lifter or follower is on the inner base circle of the camshaft lobe. Technician B says that valves are always adjusted when closed while the lifter or follower is on the camshaft lobe outer base circle. Who is correct?

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