What was an important factor that was overlooked in the $1986$ model for the spread of HIV$/$AIDS$?$

Group of answer choices

That patients who were seropositive for HIV but had not immediately developed AIDS could eventually get AIDS much later.

That patients who were seropositive for HIV could die from natural causes and not AIDS

That patients who had AIDS could die from the disease

That they should use the standard incidence model for the spread of the infection