Omar got an email stating that he needed to update the software his company uses for banking. He clicked on the link and did the upgrade, and now there are unexplained expenses from the bank. What is the MOST likely explanation for what has happened?

The most likely explanation is that Omar fell victim to a phishing scam, where the email he received was not actually from the bank but from a malicious third party pretending to be the bank. By clicking on the link and downloading the software update, he unknowingly gave the scammer access to his banking information, leading to the unexplained expenses.