Which contributes MOST to achieving the ‘collaborate across boundaries’ principle?

Comprehensive and Detailed Explanation From Exact Extract:

The principleCollaborate across boundariesemphasizes enabling effective governance across different organizations, teams, or departments. A key driver is embedding decision-making systems that bridge these organizational divisions, ensuring transparent, cross-boundary authority. As described in MSP:

“An MSP programme collaborates across boundaries: facilitating effective cross‑organizational governance.”

Thus,Dis the best option, focusing on governance that spans organizational boundaries.