Which ISDN command changes the channel selection on IOS to meet this requirement?

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Due to provider requirements, outgoing calls from the Enterprise to the PSTN must start with channel 1.

Which ISDN command changes the channel selection on IOS to meet this requirement?
A . isdn bchan-number-order ascending
B . isdn protocol-emulate network
C . isdn incoming-voice
D . isdn bchan-number-order decending

Answer: A