单选题What is the correct virtual link configuration on an OSPF router？（）Aarea 0.0.0.0{ linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}Barea 0.0.0.0{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}Carea 0.0.0.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.2.1；}Darea 0.0.2.1{ virtual-linkneighbor-id 172.168.18.2 transit-area 0.0.0.0；}
单选题
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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