The practical nurse (PN) is completing a focused assessment on a client who is prescribed oxygen at 3 liters per minute by nasal cannula. Which assessment finding by the PN requires immediate action?

The client is lying in a supine position in the bed.

The cannula is pressed snugly against the client's cheeks.

The flowmeter shows 1 liter of oxygen being delivered.

There is no humidifier attached to the delivery system.