Answer: Controlling
Explanation:
- A project management office (short form - PMO) is a management  organisation that standardizes the project-related controlling processes and facilitates the sharing of resources, techniques, tools, and methodologies.
- They are the minders of best practices, project status and direction  in a PMO.
Hence, A project management office requiring compliance with standards and procedures that have been adopted is best described as a controlling form of PMO.