Well, they kinda describe the OS I assume.
1. Linux can run for days, weeks and even years without a reboot or crash.
2. Linux is very robust, you can start and end services without reboots/restarts, its a very flexible OS. You can fully customize it as well, also its open source is a big plus.
3. It comes with 6 actually, well usually only 4 are used or needed.
Halt or shutdown, Single user, Multiuser, Graphical and then Reboot.
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