Technician a Says That OBD-II Includes Generic as Well as Vehicle

Multiple Choice

Technician A says that OBD-II includes generic as well as vehicle manufacturer's specific DTCs and data displays. Technician B says that OBD-II have common DTCs. Who is right?

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