The nurse is admitting a client from the postanesthesia unit to the postoperative surgical care unit. Which prescription should the nurse implement first?

A. A CBC in the morning is important but not immediately urgent.B. Advancing the diet is important but should be done after ensuring the patient is stable.C. Straight catheterization is important if the client cannot void, but it is not necessarily the first priority.D. Administering cefazolin 1 gram IV every 6 hours is crucial to prevent postoperative infection and should be done first to maintain the schedule and prevent any potential complications.