A Technician Is Checking the Evaporator for Leaks on an R-134a

Multiple Choice

A technician is checking the evaporator for leaks on an R-134a refrigerant system.Technician A says that it is acceptable to use shop air to pressurize the system and use an electrnic microphone to listen for leakage.Technician B says that it is acceptable to charge the system with R-134a and then insert the elctronic leak detector probe in the evaporator drain.Who is correct?

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