After resolving an intermittent network outage caused by a misconfigured firewall, what is the NEXT essential step according to the standard troubleshooting methodology?
Immediately document the resolution process in the maintenance log.
Implement an additional firewall as a backup for the current one.
Verify that all systems and services affected by the original problem and the resolution are fully operational.
Plan a meeting with the network team to propose budget increases for IT security.