Which of the following best describes the purpose of DISS?

The purpose of DISS, which stands for the Defense Information System for Security, is primarily to manage security clearance information for authorized users. This system plays a critical role in safeguarding sensitive information by ensuring that only individuals with the appropriate security clearances can access certain data. It efficiently tracks and alerts appropriate personnel about any changes in security clearance status, which is vital for maintaining national security.

While the other options mention important aspects of defense contractor operations or related analyses, they do not capture the core functionality of the DISS system. DISS is specifically tailored to the management of security clearances, making it a vital tool for both personnel security and operational security within the defense environment.