If I have an iMac (Retina 4K, 21.5-inch, 2017), can I upgrade to 10.11 Big Sur?
If I have an iMac (Retina 4K, 21.5-inch, 2017), can I upgrade to 10.11 Big Sur?
iMac 21.5″ 4K, macOS 10.13
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Yes. As clearly shown in the iMac section of the support document you posted from.
You can also upgrade directly to macOS 12 Monterey, and will be able to update to the upcoming macOS 13 Ventura when it's released this fall.
Link-> How to upgrade to macOS Monterey - Apple Support
Link-> macOS Ventura Preview - Apple
Click here to get Big Sur: link-> How to get old versions of macOS - Apple Support