【单选题】【消耗次数：1】
广域网提供两种服务模式，对应于这两种服务模式，广域网的组网方式有()。
①
虚电路方式和总线型方式
②
总线型方式和星型方式
③
虚电路方式和数据报方式
④
数据报方式和总线型方式
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