Which results will help finalize the details of the operation by confirming or disproving planning assumptions?

The correct choice is PDSS, which stands for Pre-Deployment Site Survey. This process is crucial for confirming or disproving the assumptions made during the planning stages of an operation.

PDSS involves on-the-ground assessments and direct evaluations of the site where an operation is to take place. It allows planners to gather firsthand information about the geography, local conditions, and other crucial factors that pertain to the mission. By doing so, PDSS can inform whether the planning assumptions hold true in the real-world context or if adjustments need to be made based on actual conditions observed during the survey. This direct validation enhances the effectiveness and safety of the planned operation.

In contrast, map reconnaissance primarily provides insights based on available maps and imagery, which may not capture the current state on the ground accurately. A mission request outlines the objectives of the operation but does not serve to validate assumptions. While risk assessment is important for identifying potential hazards and evaluating associated risks, it does not specifically address the confirmation of planning assumptions as explicitly as PDSS does.