Exam 640-875 Question id=4813 IPv4 and IPv6 Addressing

Given these four Class B networks: 172.104.0.0, 172.105.0.0, 172.106.0.0, 172.107.0.0, what is the supernet (CIDR) address that summarizes these four Class B networks?

A. 172.104.0.0/12
B. 172.104.0.0/13
C. 172.104.0.0/14
D. 172.104.0.0/15

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