Final answer:
A seropositive result on an HIV antibody test indicates that the person has been infected with the HIV virus at some point in the past.
Step-by-step explanation:
The correct answer is a. The person has the AIDS virus. A seropositive result on an HIV antibody test indicates that the person has been infected with the HIV virus at some point in the past. It does not necessarily mean that the person currently has AIDS, is infectious for life, or has had the infection for a long time.