Which troubleshooting tool is the most effective to display detailed real-time output of call setup on phones that are registered to a Cisco Unified Communications Manager cluster?
A. Implement DNA to create trace files.
B. Implement RTMT to create trace files.
C. Integrate an MGCP gateway with a Cisco Unified Communications Manager cluster to redirect trace files to the MGCP gateway.
D. Create trace files from Cisco Unified Reporting.
