Technician a Says the Piston Stroke Length in an EGR

Multiple Choice

Technician A says the piston stroke length in an EGR engine is often longer than one in the same model engine that doesn't have an EGR system. Technician B says that the longer stroke length used by some EGR model engines has nothing to do with the use of EGR and that some EGR engines have shorter stroke length than non-EGR model engines. Who is correct?

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