Need help understanding framework versions and location

Hi guys, I am hoping someone can clear up some questions I have about the framework; bearing in mind that on my mac, I had it installed when the ide was called MonoDevelop; so I think there might be some redundant files left behind as well.

Opening a solution in Xamarin, Project Active Runtime > gives me Mono 3.2.6, Mono 2.10.11, Mono 2.10.9

and day before yesterday from my accounts, I downloaded MonoTouch-7.2.0.2; now I guess this is the SDK settings in project; so am I up-to date with all the files, and do I still need those Mono v2 files?

Thanks in advance.

Rana Hossain