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 would display logs from the system's security log file, not necessarily the specific application's log if it's not writing there.

For systemd-based systems, applications managed by systemd often log to the systemd journal, which `journalctl` can query. The `-u application` option allows filtering logs specifically for a systemd unit named 'application', even if they are not explicitly written to a file in `/var/log`. This is a common method for viewing logs when traditional file-based logging is not used or is redirected to the journal.

systemctl application.service is used to manage (start, stop, status) systemd services, not to view their logs directly.

watch /var/lib/application/ would repeatedly execute a command, in this case `ls` on /var/lib/application/, which would show directory contents but not application logs.