2 is tha answer to Why should cloud computing not be a set of silos? Provide real or made up examples of why incompatible solutions will fail in IT.?
3 is correct because if brings you to the lock screen and lets you restart the computer
1 is wrong because if you disconnect it there is a chance if won't connect and power it anymore.
Lots of things - your car has a engine that is used as a generator (your alternator). Cell phones that vibrate have a small electric motor with an uneven weight on the rotor which causes vibration ...
Hope this helps. :)
I think the answer to this is A