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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