Technician a Says That Some Multivalve Heads Use Control Valves

Multiple Choice

Technician A says that some multivalve heads use control valves that cause only one intake valve to open at low rpm and another to open at higher rpm. Technician B says that other multivalve heads use two intake manifold runners per cylinder. Who is correct?

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