Refer to the exhibit.
Which is the most efficient summarization that R1 can use to advertise its networks to R2?
A.
172.1.4.0/22
B.
172.1.0.0/21
C.
172.1.0.0/22
D.
172.1.4.0/25
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When the subnet mask is 122, R1 can advertise its networks to R2.
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I choose
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