Which tool that is used for troubleshooting Cisco Unified Communications Manager is also used to troubleshoot and monitor Cisco Unity Connection?

Cisco Unified Dialed Number Analyzer is a CUCM-specific tool for testing dial plan digit analysis and is not available for Cisco Unity Connection.

'Cisco Unified Monitoring and Troubleshooting Tool' is not an actual named Cisco product; it is a fabricated distractor.

RTMT is a Java-based client application that connects to both CUCM and CUC clusters to provide real-time performance monitoring, log collection, and alert management. It is the standard cross-platform monitoring tool supported on both products, making it the correct answer for a tool shared between CUCM and CUC troubleshooting.

'Cisco Unified Port Monitor' is not a real Cisco tool name and does not exist as a product.

Cisco Unified Serviceability is a web-based administration interface for managing services and traces but is not the same monitoring client used across both CUCM and CUC for real-time troubleshooting.