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I guess it should be A. As it is a class C network we have 24 bits for the network Id part . Now we are left with 8 bits. As we want subnets for 32 networks so we have to reserve 5 bits for the subnet Id part . So for subnet mask we have  all 1's in place of NID and SID and rest all 0's. So we get: 1111 1111:1111 1111:1111 1111:1111 1000=255:255:255:248

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