Technician a Says That a Power Divider on a Tandem

Technician A says that a power divider on a tandem drive axle truck is always integrated in the forward differential carrier.Technician B says that the power divider on a single drive axle truck can be locked out by a switch on the dash.Who is correct?

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