Technician a Says That an Internal EGR Briefly Opens the Exhaust

Multiple Choice

Technician A says that an internal EGR briefly opens the exhaust valve during the exhaust stroke. Technician B says that internal methods result in poor mixing with the intake air and excessive EGR rates at low speeds. Who is right?

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