Which hypothesis about the origin of viruses proposes that they descend from free-living cells?

1. Three hypotheses compete over where viruses came from. 2. The devolution or regressive hypothesis says viruses evolved from free-living cells that lost their independence. 3. The escapist or progressive hypothesis instead says viruses began as nucleic acids that escaped a host cell. 4. A third idea has viruses self-replicating alongside the cells they depend on. 5. Virus molecular systematics is a field of study rather than an origin hypothesis, so it is not the answer. _Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 21 "Viruses", section 21.1 Viral Evolution, Morphology, and Classification_