Which line in the following OSPF configuration will not be required for MD5 authentication to work?
interface GigabitEthernet0/1
ip address 192.168.10.1 255.255.255.0
ip ospf authentication message-digest
ip ospf message-digest-key 1 md5 CCNA
!
router ospf 65000
router-id 192.168.10.1
area 20 authentication message-digest
network 10.1.1.0 0.0.0.255 area 10
network 192.168.10.0 0.0.0.255 area 0
!
A . ip ospf authentication message-digest
B . network 192.168.10.0 0.0.0.255 area 0
C . area 20 authentication message-digest
D . ip ospf message-digest-key 1 md5 CCNA
Answer: C