Once again, I'm confused. There seems to be 3 or more possible ways to setup DNS on OES2.Linux

(a) Manually (which is what I'm used to doing on other distros)
(b) With YaST
(c) With iManager.

On NetWare we have Dynamic DNS which registers all the workstations (but this is a bit dodgy because it keeps adding new IP Addresses as they get allocated, but it never deletes the old ones)

I haven't found how to set this up on OES2 Linux, so question 1 is, is this possible, if so how?
2. Is it better to install DNS with option (a), (b) or (c) and what are the differences?