Technician a Says That Before Checking Rotor Runout on a Truck

Multiple Choice

Technician A says that before checking rotor runout on a truck equipped with air disc brakes,the wheel bearings must be verified to be properly adjusted.Technician A says that rotor thickness is measured with a dial indicator.Who is correct?

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