2. Technician A says that checking ambient temperature as part of an AC performance test is unnecessary. Technician B says that if the AC compressor hasn't been operating, the high-side pressure should be high and the low-side pressure should be low. Who is correct?
O A. Technician A
O B. Neither Technician A nor B
O C. Technician B
O D. Both Technicians A and B

The correct option is;

B. Neither Technician A nor B

Explanation:

A performance test is meant to determine the proper functioning of the air conditioning system for fault finding where repair is required

While the engine is powered off it is expected that to have the same pressure or equal pressures in the low-side and high-side pressure and have a pressure expected for a given ambient temperature, such that, as an example, a system with R134a should have a pressure slightly more than 71 psi. at 70°F

Therefore, neither technicians A nor B is correct as the ambient temperature is important for performance testing and  high-side and low-side pressures should be equal when the engine is powered off.