Which of the following sources are typically stored in the Resources folder of the App Directory?

The correct answer identifies that the Resources folder of the App Directory typically contains various types of files crucial for the application's user interface and configuration. In the context of Mendix applications, this folder usually includes configuration files that define important application settings and environment variables. Also, HTML files can be part of the Resources folder for front-end template purposes, and Java files might be included if they serve specific configurations relating to the application's functionality or external integrations.

The inclusion of HTML and configuration files is essential for the layout and structure of web pages within the Mendix app, ensuring that the application not only displays correctly but also functions properly according to the configurations set by the developers. This allows for efficient management of resources and ensures that the application can render as intended while maintaining modular and organized code.

Other choices might reference files that do not align with the typical contents of the Resources folder. For instance, while images and CSS files are essential for styling and user experience, they are generally managed in their specific locations tailored to optimize web performance. Additionally, while JavaScript files and XML files are important, they are often stored in different directories depending on the project's structure and specific use cases within the Mendix application environment.