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Which of the following cannot be mask in CIDR? ?

a.  255.225.0.0

b .255.192.0.0

c .255.255.255.6
Explain
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a) in binary is $11111111.11100001.0.0$ so not a valid mask.
b) in binary is $11111111.11000000.0.0$ so it's a valid mask.
c) in binary is $11111111.11111111.11111111.00000110$ so not a valid mask.