A nurse is assisting in the care of a client following a tonsillectomy who is alert and has an SpO2 of 93% on room air. Which of the following actions should the nurse take?

Encourage the client to use a straw to sip cool liquids.

Place the client in a semi-Fowler's position.

Encourage the client to cough.

Obtain the client's peak expiratory flow volume.