While installing third-party software, a technician wants to monitor logs on the system continuously. Which of the following commands should the technician issue to monitor the logs?

The cat command reads and prints the entire file once then exits, providing no continuous or real-time monitoring capability.

The grep -e flag expects a regex pattern argument and searches static file contents for matches - it does not follow or monitor a file for new entries.

The head -n flag displays only the first N lines of a file and exits immediately, which is the opposite of what continuous monitoring requires.

The tail -f flag causes tail to follow the file, continuously outputting new lines as they are appended, which is exactly what is needed to monitor activity during an installation. The /var/log/messages file captures general system and application messages, making it a relevant target for watching third-party software behavior in real time.