Reverse Gear Power Flow Is Being Discussed

Reverse gear power flow is being discussed. Technician A says that power enters the transmission through the secondary shaft. Technician B says that power flows through the reverse idler gear and then the reverse output gear, rotating the countershaft in the reverse direction. Who is correct?

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