A 34-year-old postpartum woman presents 2 weeks after delivery with fever and RUQ pain. She had intrapartum penicillin for GBS. Which is TRUE regarding intrapartum prophylaxis efficacy?A≥2 hours of prophylaxis has no impactBAt least 4 hours is required; <4 hours is considered ineffective and harmfulC≥2 hours reduces bacterial load and neonatal sepsis risk, but 4 hours is optimalDOnly vancomycin prevents transmissionEProphylaxis is unnecessary if mother is afebrileCheck my answer