The small venting device that fits into the blue lumen on the top of the Salem Sump allows air _________ . This prevents trauma to the gastric mucosa due to excessive suction and also prevents regurgitation of gastric contents. Make sure you regularly check this vent to see that it has not become wet, as it will no longer function if moistened.
a. out but not in
b. in but not out
c. both in and out