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【单选题】
如果用户应用程序使用UDP协议进行数据传输，那么下列必须承担可靠性方面的全部工作的是（ ）。A.
数据链路层程序
B.
互联层程序
C.
传输层程序
D.
用户应用程序
拍照语音搜题，微信中搜索"皮皮学"使用
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C.
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D.
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