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A company has recently experienced a data breach and has lost nearly 1 GB of personally identifiable information about its customers. You have been assigned as part of the incident response team to identify how the data was leaked from the network. Your team has conducted an extensive investigation, and so far, the only evidence of a large amount of data leaving the network is from the email server. One user has sent numerous large attachments out of the network to their personal email address. Upon closer inspection, those emails only contain pictures of that user’s recent trip to Australia. What is the most likely explanation for how the data left the network?