Which statement best compares a nasal cannula and a simple face mask in oxygen delivery?

• A. The nasal cannula provides 1-6 L/min with FiO2 ~24-44%, while the simple face mask delivers 5-8 L/min with FiO2 ~35-50%.
• B. Nasal cannula delivers higher FiO2 than the mask at all times.
• C. The face mask delivers less oxygen than the nasal cannula.
• D. Nasal cannula is used only in home settings.

Answer: (A)