Which of the following would BEST help to improve an enterprise's ability to manage large IT investment projects?

Creating a change management board is primarily for handling project changes, not for the overall management of large IT investment projects across all phases.

Reviewing existing business cases helps in selecting future projects, but does not directly improve the management of current large IT investment projects.

Implementing a formal review and approval process at the end of each project phase ensures consistent oversight, validates that deliverables meet quality standards, and verifies that the project aligns with objectives before progressing. This structured approach helps identify issues early, provides control points for management, and prevents projects from going off track or incurring significant rework in later stages, thereby improving overall project management effectiveness.

Publishing the IT approval process online increases transparency but does not, by itself, enhance the enterprise's ability to actively manage projects through their lifecycle.