When you configure a T1 CAS PSTN Interface, which command instructs the router to receive its interface clocking from the service provider?

When you configure a T1 CAS PSTN Interface, which command instructs the router to receive its interface clocking from the service provider?
A. linecode b8zs
B. clock source line
C. ds0-group 1 timeslots 1-24
D. clock source internal

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