Problem: A client is treated in the emergency department for acute muscle strain in the left leg caused by trying a new exercise. During discharge preparation, the nurse should provide which instruction? "Apply ice packs for the first 24 to 48 hours, and then apply heat packs." "Apply heat packs for the first 24 to 48 hours." "Apply heat packs for the first 24 hours, and then apply ice packs for the next 48 hours." "Apply ice packs for the first 12 to 18 hours."