A newly licensed nurse working at an HIV clinic is reviewing the responsibilities of her position at the clinic. Which of the following tasks should the nurse identify as tertiary prevention?

A. Educating clients about contraindications to specific immunizations. This is an example of primary prevention, which aims to prevent disease before it occurs by promoting safe practices and avoiding harmful exposures. B. Providing clients with information about the benefits of exercise. This also falls under primary prevention, as it promotes a healthy lifestyle to prevent the onset of disease or complications. C. Using an electronic messaging system to remind clients when to take medications. This is an example of tertiary prevention, which focuses on managing chronic conditions (like HIV) and preventing complications or progression of the disease through adherence support. D. Helping clients understand health screenings covered by their insurance plans. This is considered secondary prevention, which involves early detection and prompt intervention to catch diseases in the early stages through screenings.