Which logging configuration filters out DOT1X messages like '%DOT1X-5-FAIL:Authentication failed for client ...' from being sent to syslog host 10.15.20.33?

The correct option uses logging discriminator to filter messages. The DOT1X discriminator is defined to facility drops DOT1X, meaning any message originating from the DOT1X facility will be dropped. The logging host 10.15.20.33 discriminator DOT1X command then applies this discriminator to the syslog messages sent to that specific host. The incorrect options either use the wrong keyword (msg-body or mnemonics instead of facility), use includes which would only send DOT1X messages rather than drop them, or have a typo in the discriminator name (DOTX instead of DOT1X) when applying it to the logging host.