Which of the following was a key driver for the development of the III-RM?

The key driver for the development of the Integrated Information Infrastructure Reference Model (III-RM) is Boundaryless Information Flow. This concept emphasizes the need for seamless, unrestricted access and exchange of information across various systems and platforms, which is essential for achieving effective enterprise architecture and facilitating interoperability between different organizations and technologies.

The idea of Boundaryless Information Flow strongly aligns with the objectives of the III-RM, which aims to guide organizations in managing their information systems more effectively. It promotes a holistic approach to designing enterprise architectures that support comprehensive integration and data sharing, ultimately enhancing organizational agility and response to changing business needs.

The other choices, while relevant in their own contexts, do not directly drive the III-RM's development in the same way. Clinger-Cohen relates to federal IT reform, PRINCE2 is a project management methodology, and Sarbanes-Oxley pertains to financial regulations, none of which specifically focus on the concept of information flow and integration as a foundational aspect of the III-RM.