Which indicator is better to check effectiveness of a workplace complaint system?

Correct answer: Resolution timeline confidentiality and complainant protection

The number of complaints alone cannot show whether a workplace complaint system is effective. A low number may mean that workers feel safe and problems are rare, but it may also mean that people fear retaliation, do not trust the process, or do not know how to report. A stronger evaluation checks how the system works when a complaint is made. Important features include a clear resolution timeline, confidentiality, protection from retaliation, and respectful handling of the complainant.

Option D is correct because it measures the quality and safety of the process rather than relying on a single number. Posters may show that information was displayed, but they do not prove that workers can use the system. Office size is unrelated to fairness or effectiveness. A good indicator therefore considers timely action, privacy, and complainant protection together. These features help build trust and make reporting meaningful and safe.