Which three netmasks are valid Class B contiguous subnet masks? (Choose three.)

A.
255.252.0.0
B.
255.255.64.0
C.
255.255.252.0
D.
255.255.255.0
E.
255.255.255.32
F.
255.255.255.128
Which three netmasks are valid Class B contiguous subnet masks? (Choose three.)
A.
255.252.0.0
B.
255.255.64.0
C.
255.255.252.0
D.
255.255.255.0
E.
255.255.255.32
F.
255.255.255.128
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