A systems administrator needs to list the contents of archive.tar.xz. Which of the following commands will list the files?

The `d` option with `tar` is used to find differences between an archive and the filesystem, not to list the archive's contents, and `ddf` is not a standard option combination for listing.

The `tar tJf archive.tar.xz` command uses 't' to list the contents of the archive and 'J' to specify that the archive is compressed with xz, which corresponds to the `.xz` file extension. The 'f' option is used to specify the archive file name.

The `x` option is used to extract files from the archive, not merely to list them, and the `z` option is for gzip compression, which is incorrect for an `xz` archive.

The `j` option is used for bzip2 compression, which is incompatible with an `xz` compressed archive, and thus this command would fail to correctly process the file.