A switch is set up to allow only 2 simultaneous MAC addresses per switch port. An administrator is reviewing a log and determines that a switch port has been deactivated in a conference room after it detected 3 or more MAC addresses on the same port. Which of the following reasons could have caused this port to be disabled?
A. A pc had a NIC replaced and reconnected to the switch
B. An ip telephone has been plugged in
C. A rouge access point was plugged in
D. An arp attack was launched from a pc on this port