Refer to the exhibit. What is the most efficient summarization that R1 can use to advertise its
networks to R2?
A.
172.1.4.0/25172.1.4.128/25172.1.5.0/24172.1.6.0/24172.1.7.0/24
B.
172.1.0.0/21
C.
172.1.0.0/22
D.
172.1.4.0/24172.1.5.0/24172.1.6.0/24172.1.7.0/24
E.
172.1.4.0/22