Technician a Says That the Best Way to Check for a Misfiring

Technician A says that the best way to check for a misfiring cylinder on a high-pressure common rail fuel system is to crack each injector line open one by one. Technician B says that it may be necessary to use an electronic service tool to enter new injector calibration information into the ECM memory if an injector is replaced. Who is correct?

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