What is the best use case for the new Touch UI in AEM 6.0?

The new Touch UI in AEM 6.0 is specifically designed to enhance the authoring experience for users creating content on touch-based devices. This interface allows authors to easily manage and create content using intuitive touch gestures, making it more accessible for those who prefer or require a mobile interface. The Touch UI offers features that streamline the authoring process, such as drag-and-drop functionality and a layout that is optimized for smaller screens.

This use case is significant because it reflects the shift towards more mobile-centered workflows in content management, enabling authors to work efficiently from various devices, including tablets and hybrid PCs. By facilitating content creation directly from touch-based devices, the Touch UI supports a flexible and modern approach to web content management that aligns with current trends in technology usage.

In contrast, building a separate mobile website, end-user viewing on a touch device, and constructing a responsive website focus on the user experience rather than the authoring experience. These options do not leverage the unique capabilities of the Touch UI tailored for authors working in a mobile environment. Hence, the primary focus of the Touch UI is to empower content creators, making option B the most fitting and appropriate use case.