Manager’s salary details are hidden from the employee. This is

Answer: External level data hiding is correct.

• The external level defines individual user views and specifies which parts of the database each user can see.

• Hiding the manager's salary from an employee is an example of restricting a user view, so this hiding is implemented at the external level.

• The conceptual level describes the overall logical structure of the database for administrators, not per-user visibility.

• The physical level deals with storage and implementation details, not which data individual users can see.

• "Local level" is not part of the standard three-schema architecture; the correct formal term for per-user visibility is external level.