AB is а 77-yeаr-оld mаle with a past medical histоry оf asthma, type II diabetes, hypertension, and coronary artery disease and recent hospitalization 6 weeks ago who presents to the emergency department with left foot pain and fatigue. Upon physical exam, AB is found to have a large ulcer on his left heal. MRI shows full thickness skin loss with some muscle involvement but not extending to the bone or joint. Labs/Vitals: Temp 38.2, WBC 22, HR 102, BP 90/80, A1c 13.7%, blood glucose 225 Which of these is most appropriate for initial antibiotic management for AB?