The next step in your IP telephony installation plan is to configure your Cisco CallManager Express router to connect to the PSTN. The telco is delivering a T1 PRI configured for ESF/B8ZS. You have only purchased enough capacity to support 12 voice calls. Which controller configuration best supports your installation requirements?

A.
controller t1 1/0 linecode b8zs framing esf clock source line pri-group timeslots 1-12 service primary-ni

B.
controller t1 1/0 framing b8zs linecode esf clock source network pri-group 1 timeslots 1-12,24

C.
controller t1 1/0 linecode b8zs framing esf clock source line pri-group timeslots 1-12,24

D.
controller t1 1/0 linecode b8zs framing esf clock source network pri-group timeslots 1-12 service primary-ni