A Nurse Is Caring for a Patient Following Knee Surgery

A nurse is caring for a patient following knee surgery that was performed under a spinal anesthetic. What intervention should the nurse implement to prevent a spinal headache?

A) Have the patient sit in a chair and perform deep breathing exercises.
B) Ambulate the patient as early as possible.
C) Limit the patients fluid intake for the first 24 hours postoperatively.
D) Keep the patient positioned supine.