What function makes the HIV virus unique?

It copies the information for reproduction from RNA back into DNA.
It has viral DNA that is transmitted through indirect contact with infected persons.
It attacks neurons in the nervous system and causes paralysis.
It attacks and destroys red blood cells in the bodies of its host organisms.

The function that makes the HIV virus unique is that it copies the information for reproduction from RNA back into DNA. This replication process is carried out by the enzyme reverse transcriptase, which allows the virus to integrate its genetic material into the host's DNA.