When Using a Mouth-To-Mask Ventilation Device, Supplemental Oxygen May Be

When using a mouth-to-mask ventilation device, supplemental oxygen may be provided by:
I. attaching oxygen to the enrichment port on the mask
II. wearing a nasal cannula
III. placing a nasal cannula on the patient
IV. connecting the oxygen reservoir to an oxygen source

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