Which two questions does establishing the scope of a risk assessment answer, under SP 800-30? Choose two.

Answer: B. Which decisions the assessment results support
C. How long the assessment results remain relevant

SP 800-30 says establishing scope helps determine which tiers are addressed, which parts of the organisation are affected, which decisions the results support, how long results are relevant, and what influences the need to update.

Source: NIST SP 800-30 Rev. 1 (NIST) — Task 1-2 Identify Scope