What types of data convinced researchers that HIV originated when a simian immunodeficiency virus "jumped" to humans?

What types of data convinced researchers that HIV originated when a simian immunodeficiency virus "jumped" to humans?

1. they shared common ancestors

2. HIVs can infect primates as well as humans

3. there are fewer or no plausible mechanisms for HIVs to be transmitted to monkeys or chimps

4. HIVs are ancestral to the SIVs

5. there are plausible mechanisms for SIVs to be transmitted to humans through butchering or contact with pets

6. SIVs are ancestral to the HIVs

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 HIVs can infect primates as well as humans. Researchers estimate that sometime in the 1930s a form of simian immunodeficiency virus, SIV, jumped to humans in central Africa. The mutated virus became the first human immunodeficiency virus.

5. there are plausible mechanisms for SIVs to be transmitted to humans through butchering or contact with pets

6) SIVs are ancestral to the HIV.