单选题In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?（）Ato identify valid numbers for incoming callsBto define the type of ISDN switch at the central officeCto specify the list of outgoing phone numbers used by the routerDto associate a dial configuration with a physical interfaceEto define interesting traffic that will enable the link
单选题
In the context of configuring dial-on-demand routing using ISDN, what is the purpose of the dialer-list command?（）
A
to identify valid numbers for incoming calls
B
to define the type of ISDN switch at the central office
C
to specify the list of outgoing phone numbers used by the router
D
to associate a dial configuration with a physical interface
E
to define interesting traffic that will enable the link
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