Hi -

The December 2014 CU has 3 different files to choose from.

http://support2.microsoft.com/hotfix/KBHotfix.aspx?kbnum=2910938&kbln=en-us

Which one to choose?

Also, I am running SP enterprise.   Do I still need to install Foundation, or is Server only ok?

https://technet.microsoft.com/library/dn789211%28v=office.14%29

You'll need all three files in the hotfix.  The CUs have gotten big enough that they need to be partitioned into multiple files.  

If you are running SharePoint Server Enterprise you only need the CU for Server.  It includes the files for Foundation.

Thanks Paul!

Does it matter what order we run them in?

ubersrvcab2, ubersrv1, ubersrv2013kb2910938fullfilex64glb

If I remember right only the ubersrv2013kb2910938fullfileex64glb is an exe and executable.  The other two are .cab files.  So you run the .exe and it installs all the others.