Which platform does not support R visuals in Power BI?

The option indicating that the "Publish to Web" platform does not support R visuals in Power BI is correct. R visuals rely on the execution of R scripts, which necessitate a secure environment to run the code effectively. While Power BI Desktop, Power BI Service, and Power BI Mobile all provide the necessary frameworks to render and interact with R visuals, the Publish to Web feature does not support this functionality due to potential security risks and the requirement for R runtime.

In Power BI Desktop, users can create and visualize R scripts directly, allowing for extensive data manipulation and visualization capabilities. The Power BI Service supports R visuals as well, enabling users to share reports containing R visuals with others securely. Power BI Mobile does facilitate viewing those reports but doesn't create or run R code natively; however, it can display R visualizations that have been created in the Desktop or Service environments.

In contrast, the Publish to Web functionality is meant for sharing reports publicly without the underlying security constraints, which is why it omits the capability to include R visuals. This ensures that sensitive or potentially insecure scripts are not exposed to public access through shared links.