Which of the following holds multiple connections and is usually maintained by the telephone company?（）A.DemarcB.IDFC.MDFD.110 block

单项选择题

Which of the following holds multiple connections and is usually maintained by the telephone company?（）

A.Demarc
B.IDF
C.MDF
D.110 block

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经营许可证号：湘B2-20140064

N10-004