单项选择题

Study the information and the relevant configuration file below for the Testking Branch router
What additional command must be executed on the Branch router before interesting traffic will initiate an ISDN call?()

A. (config-if)# dialer-group 1
B. (config-if)# dialer-list 1
C. (config-if)# dialer map 1
D. (config-if)# dialer-route 1

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