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What is the correct virtual link configuration on an OSPF router?()

A.area 0.0.0.0{ linkneighbor-id 172.168.18.2 transit-area 0.0.2.1;}
B.area 0.0.0.0{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1;}
C.area 0.0.0.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1;}
D.area 0.0.2.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.0.0;}

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