A nurse is teaching a client about a variety of stress management techniques. Which of the following instructions by the nurse is appropriate?

A. Breathing exercises involve inhaling through the nose and exhaling through the mouth for better oxygenation and relaxation. B. Mindfulness focuses on being present and observing thoughts nonjudgmentally, not necessarily seeking advice from others. C. Guided imagery involves imagining calming or peaceful scenarios, not stimulating ones. D. Progressive muscle relaxation involves tensing and then relaxing muscle groups to relieve tension and promote relaxation.