Which of the Following Is an Example of Whistle-Blowing

Which of the following is an example of whistle-blowing?

A) An employee discloses confidential information about the company to a rival firm for personal gain.
B) An employee suggests some process changes to his manager that he claims will increase the productivity of the team.
C) An employee avoids taking ownership of his mistakes by blaming it on his co-workers.
D) An employee informs the manager that some of his team members are misusing confidential customer details from the company database.
E) An employee who is unsatisfied with his performance appraisal requests his manager for a re-evaluation of his performance.