A 32 year old women is admitted to hospital complaining of right thigh pain.She is started empirically with OXACILLIN IV for cellulitis. The admitting physician notes that degree of pain disproportionate to the amount of overlying cellulitis.Over the course of next 24 hours ,the patient develops profound septic shock complicated by hypotension,acute renal failure and evidence of disseminated intravascular coagulation. A CT scan of her right leg demonstrates collection of fluid with gas in deep fascia of her right leg.Emergent surgical evaluation is planned.WHAT CHANGES TO THE PATIENTS ANTIBIOTIC THERAPY SHOULD BE RECOMMENDED? a:Continue oxacillin and add clindamycin b:Continue oxacillin and clindamycin and gentamycin C:Discontinue oxacillin,and add clindamycin ,Vancomycin ,Gentamycin. D:Discontinue Oxacillin and add piperacillin /tazobactam and Vancomycin. E:Discontinue oxacillin and add vancomycin and Gentamycin