Which of the following is NOT a behavioral indicator?

The correct choice indicates that all the mentioned behaviors can indeed serve as indicators of potential insider threats. However, the question specifically asks for a non-indicator, which implies identifying a behavior that does not suggest any particular threat or security concern.

Excessive absences from work can point to personal issues or disengagement, leading to concerns about an employee's commitment or potential issues that might affect their performance or security. Frequent overtime might indicate an employee is under pressure or attempting to meet deadlines, which can also signal stress or an increased workload, potentially raising flags in terms of behavior. Sudden changes in appearance often relate to emotional or psychological changes, which might hint at underlying problems that could lead to security threats.

Given this context where the question focuses on identifying a behavior that does not align with the recognized indicators of threats, choosing "D" doesn’t accurately capture the intent of the question. Each of the listed options serves a function as an indicator of changes in behavior that can be monitored for security purposes, drawing attention to potential risks.

Therefore, recognizing that all listed behaviors are indeed potential indicators emphasizes the significance of monitoring employee behavior in the context of security and insider threat assessments.