单选

在OSI参考模型的各层中，向用户提供可靠的端到端(End-to-End)服务，透明地传送报文的是(4)。

A．应用层
B．数据链路层
C．传输层
D．网络层

试题出自试卷《软件水平考试（中级）网络工程师上午（基础知识）试题模拟试卷3》

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