Answer:
Yes
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No , all wheel drive has power going to all 4 wheels all the time . MY 4x4 has power going to the rear wheels and if the rear wheels slip power also starts going to the front wheels ( unless I have 4x4 LOW selected , then power goes to all 4 wheels all the time )
When manufacturers say All wheel drive, it usually means that it is always on and the transfer case has a limited slip differential type mechanism to allow you to turn and not wheel hop. 4 wheel drive locks both axles to go at the same rate and it is difficult and causes problems when driven on hard surfaces like asphalt. Mainly for off roading or getting unstuck.