I'm pretty sure the answer is A and D. Runlevels 0 and 6 are like the black holes of the Linux universe - you don't want to get too close, unless you're into that whole 'system annihilation' thing.
This is a tricky one, but I'm betting A and D are the right choices. Who wants their system to automatically shut down or reboot every time they log in? That's just asking for trouble!
Van
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