Low-Flow Oxygen Delivery Devices

Low-flow oxygen delivery devices:
I. vary in the concentration that they deliver
II. deliver concentrations that are influenced by the patient's respiratory rate
III. deliver concentrations that are influenced by the patient's respiratory pattern
IV. deliver concentrations that are influenced by the patient's tidal volume

A) I
B) I and II
C) I, II, and III
D) I, II, III, and IV