Which federal agency is predominantly responsible for overseeing Personnel Security policies?

The correct answer is the Office of Personnel Management (OPM) because it serves as the primary federal agency responsible for establishing and overseeing personnel security policies across the federal government. OPM's role includes the formulation of standards and regulations that dictate how background investigations and clearances are conducted for government employees and contractors.

This agency ensures that proper procedures are in place for evaluating an individual's suitability for federal employment, particularly in sensitive positions where security clearances are required. Their guidelines help maintain the integrity and security of the federal workforce.

The other options, while related to national security or law enforcement, do not have the central responsibility for personnel security policy. The FBI, for instance, is more involved in criminal investigations and counterintelligence rather than the overarching personnel security policies. The CIA focuses on intelligence and national security but does not oversee personnel security for all federal agencies. The Department of Homeland Security manages a range of security concerns, but OPM remains the key agency for personnel policies.