Abylli Company does not use a database system; rather, it maintains separate data files in each of its departments. Accordingly, when a sale occurs, the transaction is initially recorded in the sales department. Next, documentation is forwarded from the sales department to the accounting department so that the transaction can be recorded there. Finally, the customer service group is notified so that its records can be updated. Describe the data redundancy and concurrency issues that are likely to arise under this scenario at Abylli.