多項(xiàng)選擇題

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

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