Which two subnetworks would be included in the summarized address of 172 31 80 0 /20? (Choose two ) A 172 31 17 4 /30 B 172 31 51 16 /30 C 172 31 64 0 /18 D 172 31 80 0 /22 E 172 31 92 0 /22 F 172 31