726. A typical membrane method nitrogen generations purge valve will open and the delivery valve will close automatically when?

A. Low oxygen content (0.5% volume) Low dew point -70°C
B. High oxygen content (5% volume) Low dew point -60°C
C. Low oxygen content (0.1% volume) High dew point -40°C
D. High oxygen content (3% volume) High dew point -55°C