which address range efficiently summarizes the routing table of the addresses for router main?()
A.172.16.0.0/18 B.172.16.0.0/16 C.172.16.0.0/20 D.172.16.0.0/21
A.255.255.255.0 B.255.255.255.128 C.255.255.252.0 D.255.255.255.224 E.255.255.255.192 F.255.255.248.0
A.any-to-many communication model B.delivery of packets to the group interface that is closest to the sending device C.one-to-many communication model D.the same address for multiple devices in the group E.one-to-nearest communication model F.a unique IPV6 address for each device in the group