Which department of the OIG provides mission and administrative support?

The Office of Management and Policy within the Office of Inspector General (OIG) is primarily responsible for providing mission and administrative support. This office plays a crucial role in ensuring that the OIG operates effectively by overseeing administrative functions and managing personnel, budgets, and planning. By maintaining the organizational structure and handling the strategic planning processes, the Office of Management and Policy enables other divisions within the OIG to focus on their core missions, such as investigations, auditing, and compliance.

Each of the other departments, like the Office of Investigations or the Office of Audit Services, has specific functions related to overseeing compliance and integrity issues, but they are not tasked with administrative support functions. The emphasis on mission and administrative support distinctly categorizes the Office of Management and Policy as the correct answer to this question.