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