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

A Maintain the head of the bed at a 30- to 45-degree angle. C Suction the endotracheal tube every 4 hours. B Provide oral care with chlorhexidine solution. D Administer proton pump inhibitors daily.