SQ presents to the emergency department with fever, chills, nausea, cough, and fatigue. She reports feeling awful for the past week. Her previous doctor started her on amoxicillin 4 days ago. Her white blood cell count was found to be elevated today. Her past medical history is significant for COPD, hypertension, dyslipidemia, and atrial fibrillation. Home medications include: lisinopril, lovastatin, procainamide, amoxicillin and some inhalers. Her chest X-ray reveals a new infiltrate. The doctor would like admit her to the general medical floor and start broad empiric coverage for her infectious process. Which of the following broad spectrum medication/s would be most appropriate to treat Sarah?