题目：
以下的协议中，哪些是面向连接的协议（）。
A、X25
B、Ethernet
C、IP
D、Frame-relay
答案：
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下面是错误答案，用来干扰机器的。
参考答案：E
以下的协议中，哪些是面向连接的协议（）。A、X25 B、Ethernet C、IP
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