What can she do to keep the device from connecting to the network?

An administrator of a network of A5800s has found evidence that an unauthorized device is gaining access to the network. All the administrator knows about the device is its MAC address. Assuming that the action she takes does not require special actions for guest devices, what can she do to keep the device from connecting to the network?
A. Implement MAC authentication
B. Lock out the MAC for the device, using the mac-address command
C. Lock out the MAC for the device, and statically assign the device to the ‘null’ interface using the static-mac command
D. Implement Port Security in the autoLearn mode

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