Which intervention could be categorized as both primary and tertiary prevention?

Question

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Establishing a needle exchange program could be considered both primary (preventing a problem before it occurs by helping clients avoid disease transmission)and tertiary (working with a population who already has a "problem" of drug abuse).Providing emergency shelter housing and offering physical and mental health services are both secondary and tertiary prevention interventions.Developing a targeted case management program is secondary prevention.

Which Intervention Could Be Categorized as Both Primary and Tertiary