问题：
[单选题]35. PIM-DM路由器向下游路由器发送剪除消息之后，如果从下游路由器收到了同一多播组的嫁接 (Graft)消息，那么下面有关该路由器响应操作的描述，哪些是正确的?
A.路由器将向下游路由器发送嫁接消息并向上游路由器发送剪除消息
B.路由器将向下游路由器发送剪除消息并向上游路由器发送嫁接消息
C.路由器将与上游路由器重新建立邻接关系
D.路由器将向上游路由器发送嫁接消息
Tags：思科认证CCIE路由和交换分类模拟试题
答案解析：
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