When preparing a double lumen endotracheal tube prior to intubation, the respiratory therapist should do which of the following?
I. Insert a stylet in each lumen.
II. Check the tracheal cuff
III. Check the bronchial cuff
IV. Apply a water soluble lubricat
A. I and IV only
B. II and III only
C. II, III and IV only
D. I, II, III and IV