A 34-year-old patient presents with a history of risky exposures including intravenous drug use and unprotected sexual intercourse with multiple partners. Out of concern for potential HIV exposure, a screening test (HIV-1/2 antigen/antibody combination immunoassay) is ordered which is positive. What is the next step in management?

1.Initiate antiretroviral therapy
2.Antiretroviral therapy resistance testing
3.HIV-1/HIV-2 antibody differentiation immunoassay
4.HIV-1 NAT (nucleic acid test)

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