When removing a package, which of the following dpkg options will completely remove the files including configuration files?

--clean is not a valid dpkg removal option; it is used in apt contexts to clear the package cache, not to remove packages.

--delete is not a recognized dpkg option for package removal.

The --purge option instructs dpkg to remove all files associated with a package, including configuration files that would normally be retained by a standard removal. This brings the package to a 'not-installed, no-config' state, which is useful when a clean reinstall or full decommission is required.

The 'remove' option (or -r) removes the package binaries but intentionally preserves configuration files in case the user reinstalls the package later.