What guidance incorporates maximum nuclear surety consistent with operations?

The correct choice emphasizes the importance of ensuring the highest level of nuclear surety in operations. DAFI 91-101 specifically addresses standards and procedures that aim to maintain a secure and safe environment for handling nuclear materials and operations. This directive is critical in minimizing risks associated with nuclear operations while balancing operational requirements, which is essential for maintaining safety and compliance in military contexts concerning nuclear weapons and related activities.

In this context, the other options are related to nuclear safety and security but do not specifically focus on assuring the maximum level of nuclear surety within operational guidance. For instance, some of the other directives may pertain to specific aspects of nuclear facility safety or regulations but do not comprehensively address the operational aspects of nuclear surety that DAFI 91-101 covers. Thus, this makes DAFI 91-101 the correct answer when discussing operational guidance that prioritizes nuclear surety.