A client with chronic obstructive pulmonary disease (COPD) has poor gas exchange. Which action by the nurse would support the client's ventilation?

Place the client in the Trendelenburg position with pillows behind the head.

Have the client rest in bed with the head elevated 15 to 20 degrees.

Encourage the client to sit up at the bedside in a chair and lean forward.

Ask the client to rest in bed in a high-fowler position with the knees flexed.