A nurse is reinforcing teaching with a client who has COPD about purse-lipped breathing. Which of the following statements should the nurse make?

A. "You should inhale through your nose and exhale through your mouth during purse-lipped breathing.": Clients should inhale slowly through the nose and exhale gently through pursed lips to maintain airway pressure and improve gas exchange. B. "You should cough forcefully during exhalation when you are purse-lipped breathing.": Forceful coughing is not part of pursed-lip breathing. The technique focuses on slow exhalation to prevent airway collapse and ease breathing, not on coughing. C. "Your inspiration should be longer than expiration during purse-lipped breathing.": Expiration should be longer than inspiration to allow the airways to remain open and reduce air trapping, which is essential in COPD management. D. "You should be flat on your back when you perform purse-lipped breathing.": Clients should sit upright or in a slightly forward-leaning position to allow optimal lung expansion. Being flat on the back can make breathing more difficult and is not recommended.