[单选]
Which of the following answers can be verified as true based on the following command output from Router R1?（）
R1#show ip ospf virtual - links
Virtual Link OSPF_VL0 to router 4.4.4.4 is up
Run as demand circuit
DoNotAge LSA alloweD.
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.

起重机完全断电时，方允许进行润滑操作。在20世纪（）年代，美国各大学先后成立了学生心理咨询机构。 20。 30。 40。 50。 What is the configured priority value of the Vlan105’s group on DS2 ？（） 50。 100。 150。 200。起重机司机在工作前应对起重机各安全装置及主要部件进行仔细检查。二手资料

Which of the following answers can be verified as true based on the following command output from Router R1?（）
R1#show ip ospf virtual - links
Virtual Link OSPF_VL0 to router 4.4.4.4 is up
Run as demand circuit
DoNotAge LSA alloweD.
Transit area 1, via interface FastEthernet0/1, Cost of using 3

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