Which command must be defined before an administrator changes the linecode value on an ISDN T1 PRI in slot 0/2 on an IOS-XE gateway?

Which command must be defined before an administrator changes the linecode value on an ISDN T1 PRI in slot 0/2 on an IOS-XE gateway?
A . isdn incoming-voice voice
B . pri-group timeslots 1-24
C . card type t1 0 2
D . voice-port 0/2/0:23

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Answer: C