When using a sniffer directly connected to an access switch, the sniffer sees an excessive amount of BPDUs with the TCA bit set. Which are the most likely explanations?
A.
There are no problems in the network.
B.
Ports connecting to workstations do not have spanning tree portfast configured.
C.
Bad cabling is being used in the network.
D.
The CPU utilization on the root switch is getting up to 99% and thus not sending out any BPDUs.