A nurse is caring for a 1-month-old infant who has had minor surgery on his abdomen. Which of the following pain scales should the nurse use to determine the infant's pain level?

Rationale: A. Numerical pain scale is appropriate for children around 8 years and older who can quantify their pain. B. Oucher scale is used for children aged 3–12 years and combines faces with numerical ratings. C. FACES scale is appropriate for children aged 3 years and older who can identify facial expressions corresponding to pain intensity. D. The CRIES scale is specifically designed for neonates and infants up to 6 months. It assesses pain based on Crying, Requires oxygen, Increased vital signs, Expression, and Sleeplessness, making it the most appropriate tool for a 1-month-old infant.