The single source of truth for a live, running Alfresco Content Services (ACS) system is the set of Java Management Extensions (JMX) MBeans exposed by the application. JConsole is a standard JMX client that connects to the running Java Virtual Machine (JVM) and allows an administrator to inspect these MBeans in real-time. This provides the actual, in-memory values of all repository properties as the application is currently using them, after all configuration files (like alfresco-global.properties), environment variables, and system property overrides have been applied. It reflects the definitive current state, not just the static configuration.

A. alfresco-global.properties: This is a static configuration file. Its values are read at startup but can be overridden by other mechanisms, so it may not reflect the live operational state.

C. repository.properties: This file, located within the Alfresco WAR, contains the system's default property values, which are intended to be overridden by alfresco-global.properties for any specific installation.

D. slingshot.properties: This file contains configuration properties for the Alfresco Share user interface, not the core repository.

1. Alfresco Content Services 7.0 Documentation, "JMX bean categories reference": "Alfresco exposes JMX MBeans that allow you to manage and monitor the server. You can use a JMX client, such as JConsole, to view the MBeans... The MBeans are arranged in a tree structure, which you can see in the JConsole MBean tab." This confirms JConsole is the tool for viewing live, managed beans representing the system's state.

2. Alfresco Content Services 7.0 Documentation, "Configuration overview": "Alfresco Content Services is configured with a set of default property files... To override the default properties, you can add your settings to the alfresco-global.properties file." This establishes that alfresco-global.properties is an override file, not the final source of truth, which is the resulting in-memory configuration.

3. Alfresco Content Services 7.0 Documentation, "Using the Admin Console - Repository Information": The Repository Information page displays details about the repository server. This information is retrieved from the live system via JMX, demonstrating that JMX is the underlying mechanism for querying the "source of truth" for a running instance. JConsole provides direct access to this JMX interface.