If a user attempts a Click-to-Call using IBM Lotus Sametime and the call gets rejected, which option is least likely to cause the problem?

A.
Rerouting calling search space on Cisco Unified Communications Manager

B.
Cisco Unified Presence SIP proxy settings

C.
Out-of-Dialog calling search space on Cisco Unified Communications Manager

D.
IBM Lotus Sametime users using the default Sametime community