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[单选题]

Your network uses the172.12.0.0 class B address. You need to support 459 hosts per subnet, while accommodating the maximum number of subnets. Which mask would you use?

A．255.255.0.0.

B．255.255.128.0.

C．255.255.224.0.

D．255.255.254.0.

E．None of the above

参考答案与解析：

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