题目内容

下列关于TCP和UDP的描述正确的是。A. TCP和UDP都是面向无连接的B. TCP是面向无连接的，UDP面向连接的C. TCP适用于可靠性较差的广域网，UDP适用于可靠性较高的局域网D. TCP适用于可靠性较高的局域网，UDP适用于可靠性较差的广域网

A. TCP和UDP都是面向无连接的
B. TCP是面向无连接的，UDP面向连接的
C. TCP适用于可靠性较差的广域网，UDP适用于可靠性较高的局域网
D. TCP适用于可靠性较高的局域网，UDP适用于可靠性较差的广域网

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