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单项选择题 Refer to the exhibit.Which is the most efficient summarization that R1 can use to advertise its networks toR2？（）: A、172.1.4.0/22; B、172.1.0.0/21; C、172.1.0.0/22; D、172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24; E、172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24

正确答案：A
答案解析：
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