A well-appearing, full-term 22-day-old infant presents with fever 101.9°F (38.8°C) and no source. According to the AAP guideline, which initial evaluation is recommended?AUrinalysis/urine culture only; discharge without blood testsBFull sepsis workup including mandatory LP and admission for all 22-28d infantsCUA/urine culture, blood culture, and inflammatory markers to guide need for LP and antibioticsDNo testing; outpatient follow-up in 24 hoursEChest radiograph and throat culture onlyCheck my answer