All accounting department users have lost connectivity. A technician verifies users are all connected through IDF3, and then verifies connectivity from IDF3 to the MDF. When physically checking the IDF3 switch, the technician sees all the activity lights on the switch are permanently lit and not flashing. Which of the following troubleshooting steps should the technician do NEXT?
A. Reboot the switch.
B. Check all the cables with a cable tester.
C. Verify the media converter is powered on.
D. Ensure all the patch cables are type 568B.