Secondary question: 3. what are (2) delivery devices that can be used to deliver oxygen to a conscious
patient, and the preferred delivery device for delivering oxygen to an unconscious
patient?

Explanation:

conscious patient = nose cannula

unconscious patient= o2 mask, most unconscious patients breathe through their mouth, or a combo of nose and mouth. That is why an o2 mask is used to ensure both routes of inhalation are covered..