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?（）A225.225.224.0.B225.225.240.0.C225.225.255.0.D255.255.255.224E225.225.255.240
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
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