Answer:
The answer is TPS, Transaction Processing System.
Step-by-step explanation:
The information about the invoices to customers is tracked by Transaction Processing System.
Transaction Processing System is a system which tracks the data involved in any transaction made. Any kind of data is stored, kept and tracked by this System. All financial transactions are being tracked through this system. Invoices generated to the customers are also tracked through this system. This is a very efficient and reliable system within the organization.