Install OSX won't recognize any drives, and Disk Utility won't let me do anything?

Hi all,

So I'm trying to sell my old Mac Mini, but in the process of wiping the drives, I unfortunately forgot to install OSX before resetting.

Now, in internet recovery mode, I'm unable to do anything to these drives (all options are greyed out), and the install osx feature doesn't show any available drives to install on.

I've browsed google for the answers, and among other things, I see that people recommend I go to View and select show all drives - but I don't appear to have this option. I'm on a late 2012 Mac Mini, and I suspect the software might be outdated? Not sure, tho.

How can I get OSX installed in this thing so I can sell it? lol