A nurse is evaluating an 8-month-old infant's pain level following the administration of hydrocodone. Which of the following pain scales would the nurse use?

A. Visual Analog Scale: The visual analog scale requires the child to understand and mark a point on a line representing pain intensity. This scale is appropriate for older children, usually around 7 years and older, and not for an 8-month-old infant. B. FACES pain scale: The FACES scale uses facial expressions to help children identify pain intensity, but it is suitable for children aged 3 years and older who can understand the concept of choosing a face to represent their pain. C. Oucher scale: The Oucher scale also relies on the child’s ability to self-report pain by selecting a photograph or numerical representation. It is not appropriate for infants who cannot communicate their pain cognitively. D. FLACC scale: The FLACC scale assesses pain in infants and young children by observing five criteria: Face, Legs, Activity, Cry, and Consolability. It allows the nurse to evaluate pain objectively in an 8-month-old who cannot verbally self-report.