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Exam 300-080 Question id=4257 Troubleshoot Call Setup Issues

Refer to the exhibit.
! (output omitted) ! controller Tl 0/0/0 framing esf 1inecode b8zs cablelength short 133 pri-group timeslots 1-24 description PRI to PSTN ! interface Serial0/0/0:23 description PSTN no ip address encapsulation hdlc isdn switch-type primary-ni isdn incoming-voice voice isdn negotiate-bchan no cdp enable ! dial-peer voice 210 pots destination-pattern 91456....... port 0/0/1:23 prefix 456 ! (output omitted) !
Local 10-digit dialing in the North American Numbering Plan to area code 456 is failing. Which two changes are needed to enable 10-digit dialing?

A. Change dial peer 210 to destination-pattern 456.......
B. Change dial peer 210 to destination-pattern 9456.......
C. Change dial peer 210 to port 0/0/0:23
D. Remove the command prefix 456 from dial peer 210