[CentOS] can i run NFS *exclusively* off of v4?

is it possible to set up NFS on centos 5.5 so that it uses *only* version 4? i tried this not that long ago on fedora and was surprised to see a complaint when i tried to start the server and was told that i was missing required functionality of NFSv1, or something equally weird. i'll check the /etc/init.d/nfs script, but i think what got me into trouble was trying to use the entire set of options:

"--no-nfs-version 1 --no-nfs-version 2 --no-nfs-version 3"

i'm going to try it again this afternoon on centos 5.5, but has anyone else tried this? should it *theoretically* work?

rday