The Salesforce Interactions SDK Launcher is a browser extension for testing and debugging. The "Force SDK URL" feature allows a developer to override the SDK (beacon) that is currently deployed on a website. This is essential for testing a site that has a production beacon with a beacon from a development or UAT dataset, without changing the site's actual code. It directs all tracking and campaign requests to the specified dataset for the developer's session only.

A. Developer tools: This is too generic. "Force SDK URL" is a specific tool within the broader set of developer tools provided by the Launcher.

C. Campaign Debugger: This tool shows which campaigns are active and why, but it does not allow switching the underlying dataset or SDK being used.

D. Inject SDK: This is used to load the SDK on a page where it is not installed at all, whereas the scenario specifies a beacon is already present.

1. Salesforce Help. (2023). Salesforce Interactions SDK Launcher Chrome Extension. "Use the Salesforce Interactions SDK Launcher to validate and debug your Salesforce Interactions SDK implementation. The Launcher has a Force SDK URL feature that you can use to override the SDK URL on the page with the one you specify."