What is the Cisco IOS command that is used to prevent the route of the incoming traffic from an unknown network?
A. Interface FastEthernet 0/0ip verify unicast source reachable-via any allow-default
B. Interface FastEthernet 0/0ip verify multicast source reachable-via any allow-default
C. Interface FastEthernet 0/0ip verify unicast destination reachable-via any allow-default
D. Interface FastEthernet 0/0ip verify multicast destination reachable-via any allow-default
