[单选] At a branch location, TestKing.com has deployed a non modular router that is equipped with two serial interfaces and two Ethernet interfaces.What additional equipment must be used to allow the branch office to connect to the central office by using an ISDN service?（）

A . a serial cable with a V.35 to RJ45 adapter
B . a CSU/DSU
C . an external ISDN TA and NT1
D . The non-modular router cannot connect to an ISDN service. The network administrator must purchase a modular router with an ISDN BRI-U card.

进行公司宏观环境分析时所考虑的主要因素包括（）政治法律环境。社会文化环境。技术环境。经济环境。地理环境。从业务上分，可将客户经理分为（）。资产业务经理。负债业务经理。公司业务经理。零售业务经理。资金业务经埋。到2014年，全球已有40多个国家颁布了网络空间国家安全战略。设计活动是一个有目的、有规划的一系列的活动的总和。比较常用的页面事件为： At a branch location, TestKing.com has deployed a non modular router that is equipped with two serial interfaces and two Ethernet interfaces.What additional equipment must be used to allow the branch office to connect to the central office by using an ISDN service?（）

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[单选] At a branch location, TestKing.com has deployed a non modular router that is equipped with two serial interfaces and two Ethernet interfaces.What additional equipment must be used to allow the branch office to connect to the central office by using an ISDN service?（）

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