Which two kinds of vulnerability does SP 800-39 say are identified most effectively at the organisation tier rather than lower down? Choose two.

Answer: A. Governance weaknesses such as inconsistent decisions about mission priorities
B. External dependencies such as electrical power, supply chain and telecommunications

SP 800-39 states vulnerabilities related to organisational governance and to external dependencies such as electrical power, supply chain and telecommunications are most effectively identified at Tier 1, while most other identification happens at Tiers 2 and 3.

Source: NIST SP 800-39 (NIST) — Task 2-1 Threat and Vulnerability Identification