Under which system would an employee's claim of sexual harassment fall?

The correct answer is the Equal Employment Opportunity system. This system is designed specifically to handle discrimination and harassment claims, including those involving sexual harassment in the workplace. It operates under federal laws that prohibit employment discrimination based on race, color, religion, sex, national origin, age, disability, and genetic information.

When an employee reports an incident of sexual harassment, the Equal Employment Opportunity Commission (EEOC) and similar agencies investigate and address these claims, ensuring that employees have a formal avenue for recourse. The focus of this system is to maintain a safe and equitable work environment for all employees and to enforce compliance with anti-discrimination laws.

The other options, while relevant to various aspects of law enforcement and military regulation, do not specifically address sexual harassment claims in the workplace context. The Naval Criminal Investigative Service primarily deals with criminal investigations within the Navy, the Military Justice system governs conduct under military law, and the Insider Threat program focuses on identifying and mitigating risks posed by personnel within an organization.