A Nurse Is Preparing a Patient for Collection of Cerebrospinal

A nurse is preparing a patient for collection of cerebrospinal fluid for Alzheimer's disease markers.How should the nurse position the patient for this procedure?

A) Assist the patient to a side-lying position with the knees pulled up to the chest and the chin tucked.
B) Direct the patient to stand facing the bed or examination table and lean forward with the chest supported on the bed.
C) Instruct the patient to lie prone on the bed with the arms folded under the head for support.
D) Move the patient into the lateral recumbent position with the head of the bed elevated 45 degrees.