A nurse is teaching a client who has a new diagnosis of Type 1 diabetes mellitus about self-administration of insulin. Which of the following instructions should the nurse include?

A. "Store the current bottle of insulin at room temperature.": Insulin can be stored at room temperature for up to 28 days (depending on the type of insulin) to prevent discomfort during injection from cold insulin. However, unused insulin should be stored in the refrigerator. B. "Use each syringe up to six times.": Syringes should only be used once to ensure safety and prevent contamination. Reusing syringes increases the risk of infection and inaccurate dosing. C. "Massage the injection site after removing the needle.": Massaging the injection site can accelerate insulin absorption, potentially leading to a rapid drop in blood glucose and an increased risk of hypoglycemia. It can also cause bruising or local tissue damage. D. "Pull back on the plunger after injecting the insulin.": Pulling back on the plunger after injecting insulin is not a recommended. This technique, known as aspirating, is no longer required because the risk of hitting a blood vessel is minimal when administering insulin subcutaneously.