Refer to the exhibit. Which Catalyst switch configuration would protect a customer network from
possible disruption in the case in which an unauthorized switch is added to the network?

A.
Switch0#show running-configuration
!
hostname Switch0
!
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
interface FastEthernet0/1
switchport protected
!

B.
Switch0#show running-configuration
!
hostname Switch0
!
spanning-tree portfast bpduguard default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
interface FastEthernet0/1
spanning-tree guard root
!

C.
Switch0#show running-configuration
!
hostname Switch0
!
no spanning-tree optimize bpdu transmission

spanning-tree extend system-id
!
interface FastEthernet0/1 switchport mode access
!

D.
Switch0#show running-configuration
!
hostname Switch0
!
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
interface FastEthernet0/1
switchport port-security violation restrict
i