On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?

On Cisco IOS XR Software, which set of commands is used to enable the gi0/0/0/1 interface for OSPF in area 0?
A . interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ! router ospf 1 network 10.1.1.1 0.0.0.0 area 0
B . interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ! router ospf 1 network 10.1.1.1 255.255.255.255 area 0
C . router ospf 1 area 0 interface GigabitEthernet0/0/0/1
D . interface gi0/0/0/0 ip address 10.1.1.1 255.255.255.0 ip ospf 1 area 0
E . router ospf 1 address-family ipv4 unicast interface GigabitEthernet0/0/0/1 area 0
F . router ospf 1 address-family ipv4 unicast interface GigabitEthernet0/0/0/1 area 0

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Answer: C