Why would FortiGate display a serial number in the Native VLAN column associated with the port23 entry?

Refer to the exhibit.

The exhibit shows the current status of the ports on the managed FortiSwitch. Access-1.

Why would FortiGate display a serial number in the Native VLAN column associated with the port23 entry?
A . port23 is configured as the dedicated management interface.
B . Ports connected to adjacent FortiSwitch devices show their serial number as the native VLAN.
C . port23 is a member of a trunk that uses the Access-1 FortiSwitch serial number as the name of the trunk.
D . A standalone switch with the shown serial number is connected on port23.

View Answer

Answer: D