Installing 12.1.x - which version of SQL Server client tools?

I'm looking at a popup dialog box on my server where I'm trying to install SEP 12.1.  It's at the Database setup portion of the install and it's telling me that I have to have the SQL Server client tools installed.  My DBA tells me that there are a lot of versions and wants to know which to install?  What can I tell him?

Thanks,
Mark