Technician a Says the Only Positive Way to Identify the Model

Multiple Choice

Technician A says the only positive way to identify the model of a transmission is by the shape of the oil pan. Technician B says the only positive way to identify the transmission model is by the ID number stamp or sticker on the transmission case. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B