Refer to the exhibit.
A network administrator wants to prevent endpoints from spoofing the MAC address of the VLAN 2 default gateway.
What should the administrator configure on Switch-1?
A . MAC lockdown of the default gateway MAC address on ports 1-20
B . MAC lockdown of the default gateway MAC address on trk1
C . default gateway MAC address as a port security authorized address on trk1
D . default gateway MAC address as a port security authorized address on ports 1-20
Answer: B