Which of the following behaviors might indicate a worker is not fit for duty?

Frequent unexplained absences can be a significant indicator that a worker may not be fit for duty. Such behavior often suggests underlying issues, such as personal problems, health concerns, or job-related stress. Regular attendance is crucial for maintaining team dynamics and productivity, and unexplained absences can disrupt workflow and affect overall team performance.

In contrast, behaviors like increased cooperation with co-workers, improving performance, and taking on additional responsibilities typically demonstrate positive engagement and a high level of commitment towards work. These actions reflect a responsible and motivated employee, indicating fitness for duty rather than the contrary.