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