Final answer:
Regular handwashing, use of barriers, and universal precautions can all help prevent HIV transmission.
Step-by-step explanation:
All of the above can help prevent HIV transmission.
Regular handwashing can help prevent the transmission of HIV by reducing the risk of coming into contact with infected bodily fluids. Using barriers, such as condoms, during sexual activity can greatly reduce the risk of HIV transmission. Universal precautions, which include practices like wearing gloves and disposing of needles properly, can also help prevent the spread of HIV.