A nurse is caring for a client who has a prescription for long-acting insulin glargine. Which of the following actions should the nurse take?

A. Store the medication vial in a freezer until ready for use: Insulin should never be frozen, as freezing alters its molecular structure and renders it ineffective. It should be refrigerated until opened. B. Let the medication warm to room temperature prior to administration: Allowing insulin glargine to reach room temperature before injection reduces local discomfort and ensures consistent absorption. This is the recommended practice for all insulin types. C. Store opened vials at room temperature for up to 3 months: Opened insulin vials may be kept at room temperature for up to 28 days, not 3 months. Extended storage at room temperature increases the risk of potency loss. D. Agitate the medication vial between the palms of the hands before use: Insulin glargine is a clear solution and should not be agitated or mixed. Shaking can cause air bubbles or damage the insulin molecules, leading to inaccurate dosing.