Is it possible to build for iOS 10?

I am trying to get my app to build for iOS 10 as that is the latest generation I have and would like to not have to purchase a later model macbook for this work.
So is it possible to build for iOS 10.
I ask as the settings don’t seem to want me to change from 11 to 10.
I just realised some 30 plus minutes later that it may be dependent on the version of Unity so I am installing 2019 and 2018 to see if either of them support older iOS.

If you are setting it in Unity, the last version you can do so is 2019.4.

I am guessing that after that you set it in xcode before your archive.