【单选题】【消耗次数：1】
广域网一般采用网状拓扑构型，该构型的系统可操性高，但是结构复杂。为了实现正确的传输必须采用（）。Ⅰ.光纤传输技术Ⅱ.路由选择算法Ⅲ.无线通信技术Ⅳ.流量控制方法
①
Ⅰ和Ⅱ
②
Ⅰ和Ⅲ
③
Ⅱ和Ⅳ
④
Ⅲ和Ⅳ
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