What are the two levels of Operating Instructions (OIs) that assign responsibilities and prescribe procedures?

The correct answer—Headquarters and Branch Operating Instructions—correctly identifies the two levels of Operating Instructions that are critical in establishing a clear chain of command and operational procedures. Headquarters Operating Instructions generally outline overarching policies and directives that govern the entire organization. They serve as a high-level guide to ensure consistency and alignment with the organization's mission and goals.

Branch Operating Instructions then provide the necessary details and modifications that are specific to a particular branch, allowing for tailored procedures that address unique operational contexts while remaining in line with the headquarters' guidelines. Together, these two levels ensure that responsibilities are clearly assigned and that procedures are uniformly understood and followed across different levels of the organization.

In contrast, the other choices either combine terms that do not align with operational structures or do not encompass the full scope needed for effective operational guidance, lacking the comprehensive hierarchy or functional relevance seen in the correct choice.