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What summary address would be sent from router A?

Refer to the exhibit.
In this VLSM addressing scheme, what summary address would be sent from router A?

640-802-cisco-certified-network-associate-ccna_img_317

A. 172.16.0.0/16
B. 172.16.0.0/20
C. 172.16.0.0/24
D. 172.32.0.0/16
E. 172.32.0.0/17
F. 172.64.0.0/16