Ethical Reasoning

The junior officers in your department are not happy about the conduct of a senior who they allege is asking for unethical favours like nepotism.
Course of actions:
1: Warn the juniors and other officers against talking to the concerned officer and reprimand the concerned officer.
2: Order an internal Inquiry to find out the truth about the allegations.
3: Order an officer to keep an eye on the activities of the concerned officer and report to you in strict confidence.