单选题What is the most efficient summarization that R1 can use to advertise its networks to R2()。A172.1.0.0/22B172.1.0.0/21C172.1.4.0/22D172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24E172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24

单选题
What is the most efficient summarization that R1 can use to advertise its networks to R2()。
A

172.1.0.0/22

B

172.1.0.0/21

C

172.1.4.0/22

D

172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24

E

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


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