A nurse is caring for a client who has an endotracheal tube and is receiving mechanical ventilation. Which of the following actions should the nurse take to reduce the risk of ventilator-associated pneumonia?

Position the head of the client's bed in the flat position.

Turn the client every 4 hr.

Brush the client's teeth with a suction toothbrush every 12 hr.

Provide humidity by maintaining moisture within the ventilator tubing.