Refer to the exhibit. A network engineer is troubleshooting a call routing issue where failed calls on the primary path (SiteA-RTR) was not sent to the secondary path (SiteC-RTR). Why is CUCM unable to extend the call setup through SiteC-RTR?
A. Stop routing on Q.931 Disconnect cause code is set to 27
B. Stop routing on Unallocated Number Flag is set to true
C. Stop Routing on User Busy Flag is set to true
D. Retry count for SIP Invite is set to 1
E. Retry count for SIP response is set to 1
