【单选题】【消耗次数：1】
关于渠道和接触点，下列说法正确的是( )。
①
渠道和接触点可以互相补充
②
渠道和接触点是企业的两个互不相关的资源
③
渠道包括电话、传真、邮件等
④
接触点只有直接接触点和间接接触点两种
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