The correct answer is that it helps to prevent resistance to a drug which might be used.
HAART has led to many improvement to different people who use it. For example, people they do experience decreasing of viral loads or the HIV amount which is in the body.
It counts for CD4 which increases when the immune cells are being destroyed by the HIV.
There is no risk for people who maintain undetectable viral load and those who take the antiretroviral therapy as the way doctor prescribes them to.
HAART is a combination of antiretroviral therapy which is referred to as (cART)