Random changes have occurred in the past few weeks on a firewall in the IT department, causing minor issues. It is discovered that an intern in the department has been accessing the firewall and making changes to practice for an exam. Which of the following BEST resolves the issue?
A. Restore the firewall configuration from backup.
B. Ensue the firmware is up to date on the firewall.
C. Ensure only authenticated users are able to access the firewall.
D. Physically secure the firewall in the datacenter.