AclassBnetwork129.35has10subnets.Whichofthefollowingoptionsisthecorrectsubnetmask?()
A. 255.255.128.0(11111111.11111111.10000000.00000000)
B. 255.255.192.0(11111111.11111111.11000000.00000000)
C. 255.255.224.0(11111111.11111111.11100000.00000000)
D. 255.255.240.0(11111111.11111111.11110000.00000000)