When checking for non-condensable inside a recovery cylinder, why should the technician allow the temperature of the cylinder to stabilize to room temperature before taking a pressure reading? a) to prevent safety valves from purging refrigerantb) it is a quick method of determining refrigerant level inside the tankc) comparisons to a pressure-temperature chart are only valid if both the pressure and temperature of the refrigerant are stable and knowd) a temperature reading alone is enough to determine refrigerant quality