A 54-yeаr оld femаle with а past medical histоry оf obesity, hypertension, and diabetes, is post-operative day # 4 following an elective total knee replacement. Her foley catheter was removed on postoperative day # 1. She is now mildly confused and incontinent of urine. The urinalysis shows 3+ leukoesterase, 3+ nitrates, 200 WBCs. The AG-ACNP treats this complicated UTI with which of the following: