how to disable wlan and wwan at startup

["pritam ghanghas gmail com" <pritam ghanghas gmail com>]

Hi

I want only wired networking from NetworkManager. 

Can I disable wlan and wwan with some configuratoion option in
nm-system-settings.conf. So that it doesn't even load the corresponding code/modules.
runtime memory consumption is important to me.

I tried looking for help on configuration but couldn't find much.

-- 
pritam