Answer: Visibly punishing unethical acts
Explanation: Unethical behavior can be defined as that behavior which cannot be considered morally rights.
In the given case the terminated managers were using company's resources for their personal benefit, this cannot be considered a moral act from the managers.
The termination of the managers done by the company is a visible punishment which is usually done to send out a strong message that such kind of behavior will not be tolerated.