A company recently experienced several security breaches that resulted in confidential data being infiltrated form the network. The forensic investigation revealed that the data breaches were caused by an insider accessing files that resided in shared folders who then encrypted the data and sent it to contacts via third party email. Management is concerned that other employees may also be sending confidential files outside of the company to the same organization. Management has requested that the IT department implement a solution that will allow them to:
Track access and sue of files marked confidential, provide documentation that can be sued for investigations, prevent employees from sending confidential data via secure third party email, identify other employees that may be involved in these activities.
Which of the following would be the best choice to implement to meet the above requirements?