Which of the following commands is used to retrieve a summary of configuration changes in Splunk?

The command that retrieves a summary of configuration changes in Splunk is indeed "splunk btool config summary." This command provides a consolidated view of any changes made to configuration files, helping administrators monitor and document modifications that may affect the behavior of their Splunk environment.

Using this command allows users to quickly assess the current configuration state versus previous configurations, enabling better change management and tracking. This is particularly useful in larger environments where multiple users may be making changes, ensuring that everyone remains aware of the configuration landscape.

The other options listed serve different purposes: one lists specific changes, another checks for configuration validity, and yet another presents checks on configurations. However, none of these specifically summarizes changes as effectively as the command that retrieves a summary of configuration changes does.