Karan manages a law firm that deals with the mergers and acquisitions of various businesses. To maintain the confidentiality of such deals, Karan has initiated a monitoring process to review the emails and social network activity of the employees in his office. Which best practice should Karan adopt while enforcing this monitoring protocol? A. enlist an external agency to keep an eye on personal visits of employees B. split the employees into groups based on their trustworthiness C. perform arbitrary checks on select employees from the office D. disclose to the employees that their emails will be monitored E. hire a person to spy on the employees in the office