What type of investigation does Chris correctly identify related to PSIs?

The identification of the first option as correct relates to the role of the Office of Personnel Management (OPM) in conducting personnel security investigations (PSIs) for the Department of Defense (DoD). This partnership allows the DoD to utilize OPM's resources and expertise in evaluating individuals for security clearance suitability. OPM conducts various types of investigations, including background checks, which help ensure that personnel meet necessary standards for security clearances.

The use of OPM by the DoD exemplifies a collaborative approach to maintaining national security while efficiently managing the large volume of personnel needing background checks. This cooperation streamlines the investigative process and leverages OPM's established protocols and methodologies for thorough and reliable assessments.

Understanding this relationship is crucial for comprehending the personnel security landscape, particularly how investigations are conducted in relation to federal security clearances.