A Patient with HIV Infection Has Been Receiving Antiretroviral Therapy

A patient with HIV infection has been receiving antiretroviral therapy for 2 months.At the initiation of treatment,the patient had a viral load (VL) of 60 copies/mL and a CD4 count of 450 cells/mm³.Today's lab results reveal a VL of 20 copies/mL and a CD4 cell count of 800 cells/mm³.How will the nurse interpret the patient's results?

A) A drug-resistant strain is likely.
B) The patient is progressing as expected.
C) The patient's treatment goals have been met.
D) Treatment failure has occurred.