A nurse is providing discharge teaching to the parents of a school-age child following surgery and cast application to the right forearm. Which of the following information is the priority for the nurse to include?

Examine the child for skin irritation at the cast edges.

Use a hair dryer on cool setting to relieve itching.

Restrict the child's strenuous activities for 3 days.

Monitor for pallor or swelling in the child's affected hand.