A 35-year-old woman presents with fever, flank pain and rigors. She is tachycardic and has costovertebral angle tenderness. There is no pregnancy. According to Australian antibiotic guidelines, which is the most appropriate initial management?AOral nitrofurantoin alone at homeBSingle-dose oral fosfomycin then review in a weekCAdmit for intravenous ceftriaxone and fluid resuscitationDTreat with topical oestrogen creamENo antibiotics; symptoms are likely viralCheck my answer