In individualism approach that course of action is moral which would provide maximum individual benefit. According to this approach moral course of action would promote the best long term interest of the individual (Salisbury University, Ethics and Social Responsibility).
In this case if Antonio takes the entire matter from Kevin and deal with it by himself, it would definitely provide maximum benefit for him in the long run. Apparently it might not seem to be the best option as Antonio might lose his job in the process. But if he could manage the situation it would definitely prove that he has strong principles and managerial skills. This would certainly be beneficial for him in the long run. Even if he loses this job, he can represent this incident as an example of strong ethics and principles in future.
2) If I would have been in the position of Antonio, I would have chosen the third option which is mentioned above. If decision is taken realistically then suppressing the entire matter would provide the best result in the short term.
This decision would have been at the conventional level of moral development, because in conventional level decisions or actions are taken by comparing overall views on that action in the society.
There are several important reasons behind this. First of all this is information age, as a result if any organization really want to know about the past experience of any candidate, it can easily do that despite of all the attempts of hiding information from candidate’s end.