What innovative technology did NeXT’s product capitalize on?

The correct response highlights that NeXT’s product capitalized on the graphical user interface (GUI), which was a significant advancement in computing technology. The GUI allows users to interact with a computer using visual elements such as windows, icons, and menus, rather than relying solely on command-line input. This made technology more accessible to a broader audience, as it simplified interactions with computers and applications.

NeXT, founded by Steve Jobs in the late 1980s, utilized this innovative approach in their computer systems, further enhancing user experience and functionality. By focusing on a visually driven interface, NeXT's machines became an integral part of the development of user-friendly operating systems and influenced many modern interfaces found in today's computing environments, including MacOS.

The other options reflect important technologies but do not align specifically with what NeXT's product was primarily known for. Touchscreen interfaces were not the main focus at that time, cloud computing became prominent later, and while artificial intelligence was certainly a field of interest, it wasn't the central innovation associated with NeXT's offerings. Thus, choosing the graphical user interface captures the essence of NeXT’s technological innovation.