Technician a Says That When Rebuilding a Differential Carrier,a Crown

Multiple Choice

Technician A says that when rebuilding a differential carrier,a crown and pinion gearset can often be reused.Technician B says that when either a crown or pinion gear have been diagnosed defective,they should both be replaced as a matched unit.Who is correct?

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