Default subnet mask for Class A, B, and C ?
a. 0.255.255.255, 0.0.255.255, 0.0.0.255
b. 255.0.0.0 , 255.255.0.0, 255.255.255.0
c. 255.255.255.0, 255.255.0.0, 255.0.0.0
d. 0.0.0.0, 0.0.0.255, 0.0.255.255
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