问题：
[单选题]The network administrator needs to address seven LANs. RIP version 1 is the only routing protocol in use on the network and subnet 0 is not being used. What is the maximum number of usable IP addresses that can be supported on each LAN if the organization is using one class C address block?（）
A、8
B、6
C、30
D、32
E、14
F、16
参考答案：
C
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