Backup Exec 2012 SP2 SCL for VMware vSphere vCenter vServer

I have looked around and can't find any clarification on this.  On the Backup Exec 2012 SP2 Software Compatibility List, it states that vCenter 5.1 Update 1 is supported.  On the VMware website, there is a vCenter 5.1.0 Update 1a and 5.1.0 Update 1b, but no plain 5.1 Update 1.  Are both supported?

PS don't even get me started on just how stupid I think VMware's revision numbering/lettering/updating is...