【单选题】
Which of the following answers can be verified as true based on the following command output from Router R1?（）<br /> R1#show ip ospf virtual - links<br /> Virtual Link OSPF_VL0 to router 4.4.4.4 is up<br /> Run as demand circuit<br /> DoNotAge LSA alloweD.<br /> Transit area 1, via interface FastEthernet0/1, Cost of using 3
A、R1 is configured with an area 0 virtual - link 4.4.4.4 cost 3 command.
B、The ping 4.4.4.4 command on R1 must currently be successful.
C、R1's Fa0/0 OSPF cost is 3.
D、4.4.4.4 is known to R1 based on a Type 1 LSA in area 1.
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