Which configuration implements the most secured OSPF authentication mode on Cisco IOS XE?
A. interface Gi0/0/0/0ip ospf authentication message-digestip ospf message-digest-key 1 md5 cisco
B. router ospf 1area 1authentication message-digestinterface GigabitEthernet0/0/0/0message-digest-key 1 md5 cisco
C. router ospf 1area 1interface GigabitEthernet0/0/0/0authentication message-digestmessage-digest-key 1 md5 cisco
D. router ospf 1area 1 authenticationinterface GigabitEthernet0/0/0/0 ip ospf authentication-key cisco
E. interface Gi0/0/0/0ip ospf authenticationip ospf authentication-key cisco
