单项选择题
HowisthecostofavirtuallinkinOSFPcalculated？（）
- A.Takesthemetricoftheoutgoinginterface.
B.Usesthemetricthatisassignedduringconfiguration.
C.Usesthepathmetrictoreachthevirtualneighbor.
D.Usesadefaultofzerounlessotherwisespecified.
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