Which of the following commands is used to rotate, compress, and mail system logs?

`rotatelog` is typically part of Apache and specifically rotates Apache access and error logs, not a general system log rotator.

`striplog` is not a standard command for log rotation, compression, or mailing.

`syslogd` is the system logging daemon; it doesn't have a `--rotate` option for managing log file rotation, which is handled by a separate utility.

`logrotate` is the standard Linux utility that automates the rotation, compression, and removal of log files, with options to mail logs, based on defined configuration policies.

`logger` is a command used to send messages to the system log, not to rotate or manage existing log files.