Create a directory $/$mnt and add all the department directories within it$.$

Create the above mentioned files in the directories.

Configure permissions to add, modify, and delete the data folder directories and files by their respective user owners and group members only.

Make sure user and group ownerships are given only to department members.

Switch to users of different departments and try accessing the data folders of other departments. It should show the permission denied error.

For example, switch to user John of the IT department and try to access the HR$\_$DATA folder. It should throw a permission denied error.