A nurse is caring for an 18-month-old infant who is 12 hr postoperative following a myringotomy. Which of the following pain rating scales should the nurse use?

A. The Poker Chip Tool is used to assess pain in children who can understand the concept of "a few" to "lots" of pain, typically in older children. It is not appropriate for infants or toddlers. B. The Color tool is used for children who can associate color with pain intensity, but it is generally for older children who can understand this system, not for infants. C. The Numeric scale is designed for children who are old enough to understand and use numbers (typically older than 8 years). An 18-month-old would not be able to understand this scale. D. The FLACC (Face, Legs, Activity, Cry, Consolability) scale is specifically designed to assess pain in infants and nonverbal children. It uses behavioral indicators to rate pain intensity and is appropriate for an 18-month-old toddler.