An administrator needs to look at a log for an application on a systemd-based system. There is no log for this application in /var/log. Which of the following is another way to view the application…

tail -f /var/log/secure streams the security and authentication log, not an application-specific log, and would not contain the target application's output.

journalctl is the command-line tool for querying the systemd journal. The -u flag filters log output by a specific systemd unit (service), making 'journalctl -u application' the correct way to view logs for an application managed by systemd when no flat file exists in /var/log.

systemctl manages service state (start, stop, status) and does not display the full application log journal.

watch reruns a command at intervals, and /var/lib stores application state data, not log output.