A nurse is caring for a school-age child who has a new plaster cast to stabilize a fracture of the radius. Which of the following actions should the nurse take to prevent the development of compartment syndrome in the affected extremity?

Apply hot air from a blow dryer to the cast.

Instruct the child to avoid moving the fingers of the affected extremity.

Place the affected extremity in an elevated position above the heart.

Monitor the capillary refill of the child's fingers once every day