单选题PIM利用声明(Assert)机制来()A维护邻居关系B为特定组播源选择转发器C维护组播树D维护RP信息

单选题
PIM利用声明(Assert)机制来()
A

维护邻居关系

B

为特定组播源选择转发器

C

维护组播树

D

维护RP信息


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