[单选题]

You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?

A．225.225.224.0.

B．225.225.240.0.

C．225.225.255.0.

D．255.255.255.224

E．225.225.255.240

参考答案与解析：

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