Choice A rationaleThe exenatide immediate-release injector pen should be discarded after 30 days, not two months, to ensure medication efficacy and prevent contamination.Choice B rationaleExenatide is administered subcutaneously, not intramuscularly. Proper administration ensures optimal absorption and effectiveness of the medication in managing blood glucose levels.Choice C rationaleOpen exenatide injector pens should be stored in a refrigerator, not at room temperature, to maintain stability and potency of the medication.Choice D rationaleTaking exenatide one hour before morning and evening meals enhances its efficacy by optimizing postprandial glucose control and reducing gastrointestinal side effects.