In healthcare settings, nurses must be familiar with primary, secondary, and tertiary levels of care.

(A) The teenager is already coping ineffectively and requires early detection and treatment, which is secondary prevention. (B) The client must be sent to a rehabilitation unit, which requires tertiary prevention. (C) Reducing the incidence of disease through education supports primary prevention. (D) A client with identified symptoms of post-traumatic stress disorder requires intervention by treatment.