Option 1, since that’s the only option actually showing you iso files. If you need help choosing the right file, you can specify your server hardware here.
From the link build.yunohost.org, you can choose yunohost-bullseye-11.0.9-amd64-stable.iso This ISO will work on a x64 Intel or AMD computer.
i386 is build for older computer that cannot support 64bit
rpi is made for Raspberry (if I’m not wrong …)
You can choose any other stable iso image. And if it’s not the last version, it doesn’t matter, you can update Yunohost later.