A nurse is caring for a client who is postoperative following a right radical mastectomy. The client has a Jackson-Pratt (JP) drain in the surgical site. Which of the following assessment findings indicates the JP drain is functioning correctly?

B The bulb reservoir is half-full and expanded with 30 mL of serosanguinous fluid. D The bulb reservoir is compressed and contains 50 mL of purulent drainage. A The bulb reservoir is flat and contains 10 mL of serosanguinous fluid. C The bulb reservoir is fully expanded and contains no fluid.