When auscultating a client's abdomen, the practical nurse (PN) listens for bowel sounds for three minutes without hearing any peristaltic sounds. Which action should the PN take?

Continue to auscultate the abdomen for a longer time period.

Determine if the client needs to empty his bladder.

Ask the client to flex his knees to relax the abdomen.

Notify the charge nurse of the absence of bowel sounds.