Network users reported that a recent firmware upgrade to a firewall did not resolve the issue that prompted the
upgrade. Which of the following should be performed NEXT?


A. Reopen the service ticket, request a new maintenance window, and roll back to the anterior firmware
version.

B. Gather additional information to ensure users' concerns are not being caused by a different issue with
similar symptoms.

C. Employ a divide-and-conquer troubleshooting methodology by engaging the firewall vendor's support.
D. Escalate the issue to the IT management team in order to negotiate a new SLA with the users' manager.