Which of the following is another way to view the application log on this system?

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 log on this system?
A. tail -f /var/log/secure
B. journalctl -u application
C. systemctl application.service
D. watch /var/lib/application/