作为对X. 25标准的扩充,CCITT提出了一套与分组拆包(PAD)设施有关的三个标准,他们是
A.X. 3、X. 25和X. 28
B.X. 3、X. 25和X. 29
C.X. 3、X. 28和X. 29
D.X. 25、X. 28和X. 29
正确答案是C
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