Can more than three regions be used to calculate an ISS?

When discussing the calculation of a security incident score (ISS), it's essential to understand that the standard practice typically limits the assessment to three regions. This limitation is often grounded in the desire to maintain consistency and comparability across different assessments. By using a maximum of three regions, organizations can ensure that the methodology remains manageable and that any scoring remains relevant and actionable.

Selecting "B" as the answer reflects adherence to this common standard, indicating that more than three regions generally are not included in the ISS calculation. While some frameworks may allow for flexibility in specific contexts, the most widely accepted guidelines restrict the evaluation to three regions to preserve the integrity and reliability of the scoring system. These constraints help organizations effectively assess risks without overwhelming complexity or variance in the outcome.

If there are guidelines in some contexts that specify otherwise, such scenarios are exceptions rather than the rule. Hence, the choice clearly aligns with the overarching norm in ISS calculations.