Answer:
See explanation below for answer.
Step-by-step explanation:
The manager should embark on an investigation, in order to get to the bottom of the matter. The accusation must be treated seriously in order to make sure that the root cause of the problem is established, this will be done with the details of the harassment that the employee provides.
Also, the witnesses that the employee has mentioned must be questioned in order to establish the facts of the issue. The matter must be treated with the utmost urgency, in order to stop the issue from repeating itself, because this will affect the productivity of the affected employees if left unchecked.