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

"You should cough forcefully during exhalation when you are purse-lipped breathing."

"You should inhale through your nose and exhale through your mouth during purse-lipped breathing."

"Your inspiration should be longer than expiration during purse-lipped breathing."

"You should be flat on your back when you perform purse-lipped breathing."