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:有
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