For systems protecting occupiable spaces, what must be considered regarding the possibility of a clean agent migrating to adjacent areas outside the protected space?

• A. The possibility of migration
• B. Migration is impossible
• C. Migration is desirable
• D. Migration is irrelevant

Answer: (B)

The main idea here is understanding how a clean agent system interacts with spaces outside the protected enclosure. When a system is designed for occupiable spaces, the expectation is that the protected area is kept physically separate from surrounding areas through solid barriers and proper integrity, so the agent cannot migrate into adjacent spaces.

If those barriers and enclosure details are robust, the design treats migration as not a factor in the protection calculations—essentially, as something impossible in the intended construction. This is why the best choice is that migration is considered impossible under a properly designed system: the protected space remains self-contained and does not let the agent spill over into neighboring areas.

Of course, in real-world design, this is contingent on maintaining that enclosure integrity—doors kept closed, penetrations sealed, and any openings adequately controlled. If those conditions aren’t met, migration could become a real concern, and the assessment would shift accordingly.