A systems administrator is compressing old log files in order to save space. Which of the following commands will allow the administrator to save the most space?

`bzip2` offers better compression than `gzip` but is generally less efficient in terms of compression ratio compared to `xz`.

`xz` utilizes the LZMA2 compression algorithm, which is known for achieving superior compression ratios compared to `gzip` (LZ77) and `bzip2` (Burrows-Wheeler). While it may take longer to compress and decompress, its ability to create smaller archive sizes makes it ideal for maximizing space savings.

`tar` is an archiving utility used to combine multiple files into a single archive, but it does not perform compression itself.

`gzip` is a widely used compression utility, but it typically provides the lowest compression ratio among the three mentioned compression tools (`gzip`, `bzip2`, `xz`).