A nurse is teaching about deep-breathing exercises with 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 hold my breath for 5 or 6 seconds each time."

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

"I will focus on how the muscles in my stomach feel with each breath."

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