单项选择题

A.all active AVF routers as the first response is used ……

In GLBP， which router will answer on client ARP requests？（）

A.all active AVF routers as the first response is used by the client
B.the AVG router，replying with a different AVF MAC address each time
C.a random AVF router， based on a GLBP seed hash key
D.only the AVG router that received the ARP request first

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