For some unknown reason, a network switch turns itself off at some point during the night. An administrator places a temperature monitor in the network closet. Which of the following BEST describes what the administrator is testing?
A.
The HVAC is not functioning properly.
B.
The network switch is running on the incorrect frequency.
C.
The VLANs are not configured correctly.
D.
The switch does not support power over Ethernet.