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【单选题】
以下关于数据报服务的描述,哪一项是不正确的。A.
同一报文的不同分组可以由不同的传输路径通过通信子网
B.
在每次数据传输前必须在发送方与接收方之间建立一条逻辑连接
C.
同一报文的不同分组到达目的结点时可能出现乱序、丢失现象
D.
每个分组在传输过程中都必须带有目的地址与源地址
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