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?

Use a hair dryer on cool setting to relieve itching.

Examine the child for skin irritation at the cast edges.

Restrict the child's strenuous activities for 3 days.

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