Refer to the exhibit. 

A collaboration Engineer using the SHOW EIGRP service-family External-client IOS Command, noticed that a CUCM failed to register as an external SAF Client on a Cisco IOS router named SiteC-CRTR. The engineer has collected snippets of the IOS configuration screenshots and CUCM trace shown in the exhibit. What is the reason for the registration failure? 

Answer options:

A. Password mismatch between CUCM and Router SAF configuration.
B. sf-interface loopback0 command missing under service-family ipv4 autonomous-system 1.
C. SIP trunk IP address pointing to a different address than SAF Forwarder address.
D. Name mismatch between SAF Forwarder name info field and external-client name on router.
E. ip multicast-routing command missing on router configuration.

B