A nurse is teaching deep-breathing exercises to a client who reports experiencing intense stress at work. Which of the following statements by the client indicates an understanding of the teaching?

"I will inhale through my mouth and exhale rapidly."

"I will focus on how the muscles in my stomach feel as I breathe."

"I will hold my breath for 5 or 6 seconds each time."

"I will focus on the causes of my stress during the exercise."