Comprehensive Explanation

Adobe Experience Manager provides client-library debugging functionality to help developers inspect JavaScript and CSS resources included through the AEM client library system.

Client libraries frequently combine and minify multiple JavaScript and CSS files to improve production performance. This optimization can make it difficult to determine which source file contains a defective event handler.

Adobe documents the debugClientLibs=true query parameter as a mechanism for examining the underlying files embedded within client libraries.

The developer can append this parameter to the page URL:

/content/mysite/en/home.html?debugClientLibs=true

After reloading the page, the developer can inspect the generated client-library references to identify the original source files and troubleshoot the relevant JavaScript.

Option B is incorrect because examining repository configuration folders is not the most direct approach for diagnosing client-side event behavior.

Option C primarily supports debugging Adobe Experience Cloud and Experience Platform integrations rather than general component event handlers.

Option D can assist with investigating failed network requests, but it does not specifically activate AEM client-library debugging.

Qualification: Enabling debugClientLibs does not itself identify a faulty button event handler. The developer should subsequently use browser developer tools, JavaScript breakpoints, and event-listener inspection to isolate the problem.

Official Adobe Reference: Using Client-Side Libraries — Debugging Tools, See Embedded Files.