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Which address range efficiently summarizes the routing table of the addresses for router Main?

Refer to the exhibit. Which address range efficiently summarizes the routing table of the addresses for router Main?

200-105-interconnecting-cisco-networking-devices-part-2-icnd2-v3-0_img_151

A. 172.16.0.0./21
B. 172.16.0.0./20
C. 172.16.0.0./16
D. 172.16.0.0/18