A nurse is preparing to apply a Venturi mask to a client with chronic obstructive pulmonary disease (COPD) who requires precise oxygen delivery. Which of the following nursing actions are appropriate when administering oxygen via a Venturi mask? (Select all that apply)

Select the highest oxygen concentration adapter available to ensure maximum oxygen delivery.

Position the mask over the client's nose and mouth and secure it with elastic straps so it fits snugly.

Attach the correct jet orifice and adjust the oxygen flow rate to the prescribed liters per minute.

Humidify the oxygen when using the Venturi mask to prevent mucous membrane dryness.

Use a flow rate lower than 4 L/min to avoid oxygen toxicity.