Manager's salary details are hidden from the employee. This is called as

Explanation

External level (highest level). It is the user's view of the database and it describes part of the database for Particular group of user and provides a powerful and flexible security mechanism by hiding part of the database from certain users. The user is not aware of the existence of any attribute that are missing from the view. It permits user to access data in a way that is customized to their needs. So that the same data can be seen by different user in different ways, at the same time.