What type of report is used to make a national security eligibility determination?

The correct answer is a background investigation report because it is specifically designed to gather and assess information about an individual's past, character, and behavior to determine their eligibility for access to national security information or positions that require a security clearance. The background investigation includes checks of criminal records, employment history, credit reports, and references, providing a comprehensive overview of the individual's reliability, trustworthiness, and potential risk to national security.

Other types of reports listed do not fulfill this function. An annual performance review evaluates an employee's job performance and productivity but does not assess their security eligibility. A financial audit report focuses on an entity's financial practices and compliance, lacking relevance to personal trustworthiness or national security. A skills assessment report evaluates a person's abilities related to a specific job task or function, but it does not encompass personal history or behavior in the context of security clearance determinations.