Which two subnetworks would be included in the summarized address of 172.31.80.0 /20? ()
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、172.31.192.0/18