nfs 3 or 4??

[Knapp]

I have installed and set up the nfs server but when you get to the
auto-mount bit it gives two different formats, one for 3 and one for
4. The aptitude show says:  The NFS kernel server is currently the
recommended NFS server for use with Linux,
 featuring features such as NFSv3 and NFSv4.

So what settings do I use? Is this 3 or 4???
Thanks all.

-- 
Douglas E Knapp

Open Source Sci-Fi mmoRPG Game project.
http://sf-journey-creations.wikispot.org/Front_Page
http://code.google.com/p/perspectiveproject/