[A, not B] Each GitHub-hosted runner is a new virtual machine (VM) hosted by GitHub with the runner application and other tools preinstalled, and is available with Ubuntu Linux, Windows, or macOS operating systems.
[E] When you use a GitHub-hosted runner, machine maintenance and upgrades are taken care of for you.
Reference:
https://docs.github.com/en/[email protected]/actions/concepts/runners/github-hosted- runners