The nurse is caring for a patient who has had a chest tube inserted and connected to a portable water-seal drainage system. The nurse determines that the drainage system is functioning properly when he observes which one of the following?
A) A dependent loop in the tubing
B) Continuous bubbling in the suction chamber and intermittent in the water-seal chamber
C) Tubing is clamped at most proximal point to patient
D) Drainage system placed on table next to patient