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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