How can the un-dead be stopped?

The un-dead can be stopped by protecting your self at all times.

Explanation:

Short they can't be stopped

Explanation:

If you are speaking about reality, they have already been stopped by a natural factor, so there is no need to fear them XD

But if you are talking movie style, just a quick pop to the head will (and should, if not, you are in some deep trouble) do the job, but if there are too many, then you may want to hole up somewhere and leave them bad boys alone. :)

answer; i believe that the correct answer is (north and south);