What is the purpose of a network mask?

What is the purpose of a network mask?
A . It is used in conjunction with the wildcard mask to determine the number of hosts on a network.
B . It is used to define which parts of the IP address are allocated to host addresses and network prefixes.
C . It is used to hide subnets from external networks by masking the subnets with NA
E . It is used to differentiate a network as a classful network or a classless network.

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Answer: B