Sami Hassan is an accountant responsible for updating the payroll master-files at Auto Show Company that sells luxury cars. One morning when Sami was checking the accuracy of the recent changes made to the payroll master-file, he realized the several unauthorized changes were made to the payroll master-file. Sami immediately reported the matter to his supervisor.

1. What could be possible consequences of the unauthorized changes made to the payroll master-file?
2. How could Auto Show company prevent this from happening in the future?