oracle client _db doubt_linux

Hi,

I finish installation oracle db (base _release) 11.2, then  11.2.0.3 and finally 11.2.0.3.7

now, I need to isntall client oracle db, so:

1_download 32 bit? or download 64 bit?

2_do I need update the release of client oracle db? (like I explain above) 

3_ in e delivery I see: oracle database 11g release 2 client (11.2.0.1.0) for linux, it's allright to download?

thanks in advance