Technician a Says That Using a Scan Tool to De-Activate

Technician A says that using a scan tool to de-activate the Torque Converter Clutch (TCC) with the engine idling in drive with the brake applied is a typical, manufacturer recommended troubleshooting task. Technician B says that diagnosis is a waste of time on a faulty transmission since it will be rebuilt anyway. Who is correct?

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