Which command is used to set MD5 as the log checksum?

Setting MD5 as the log checksum is achieved by using the command that directly specifies the logging settings, particularly focusing on the checksum algorithm. The command "set log-checksum md5" is designed to configure the log system to utilize the MD5 algorithm for generating checksums. This feature is important for ensuring the integrity and authenticity of log messages by verifying that they have not been altered during transmission or storage.

The other options, while they might seem related to configuration commands, do not focus specifically on setting the log checksum to MD5. They either address broader configuration areas or do not specify the correct syntax for establishing the MD5 checksum as desired. Hence, the choice that clearly states the action of setting the log checksum using the proper syntax is the right answer.