Which configuration implements the most secured OSPF authentication mode on Cisco IOS XE?

A.
interface Gi0/0/0/0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 cisco

B.
router ospf 1
area 1
authentication message-digest
interface GigabitEthernet0/0/0/0
message-digest-key 1 md5 cisco

C.
router ospf 1
area 1
interface GigabitEthernet0/0/0/0
authentication message-digest
message-digest-key 1 md5 cisco

D.
router ospf 1
area 1 authentication
interface GigabitEthernet0/0/0/0
ip ospf authentication-key cisco
E: interface Gi0/0/0/0
ip ospf authentication
ip ospf authentication-key cisco