A 5-year-old patient is diagnosed with an uncomplicated urinary tract infection for the first time. The nurse practitioner should order:

Rationale: A. Cephalexin (Keflex) is a first-generation cephalosporin commonly used as a first-line oral treatment for uncomplicated urinary tract infections in children. A 7–10 day course is effective for eradicating infection while being well-tolerated. B. Ciprofloxacin (Cipro) is generally avoided in children due to potential adverse effects on cartilage and is reserved for complicated or resistant infections. C. Ceftriaxone (Rocephin) IM is typically reserved for severe infections, hospitalized patients, or when oral therapy is not feasible. It is not first-line for uncomplicated UTIs in outpatient children. D. Nitrofurantoin (Furadantin) is effective for lower urinary tract infections but is usually avoided in children under 1 month and is less preferred in some cases for first-time infections due to limited tissue penetration.