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【单选题】

You have just obtained a modular Cisco router with 2 serial connections and a BRI/U interface. What other physical piece of hardware is required in order to establish an ISDN connection?（）

A、Nothing. The router is already suitable.

B、A BRI WAN interface in the router.

C、An external NT1 to terminate the local loop.

D、A TA/NT1 device on the router.

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