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Cyberattack Situation

Mr. Oliver is a young entrepreneur that owns a cybersecurity company called Leveling Up. Recently his company has had a lot of success and is doing much better than its competitors. While on a business trip to make contacts abroad, Mr. Oliver receives a call notifying him that confidential information about their customers was leaked, and in the process, many classified files about how they spend their money and their secret code for their innovative cybersecurity were also stolen.

Because it's a large company, 15 executive employees have access to the secret code to monitor the progress of their cybersecurity infrastructure closely. Although with little hope, Mr. Oliver contacted the police and reported the crime. He told them that each working day of the week, different groups of 3 executives are allowed in the "Shield Room" where the files are.

Which executive was the one that stole the information?