Final answer:
The 'invoiceless' system designed to avoid the document matching process is Evaluated Receipt Settlement (ERS), which allows payment processing based on the purchase order, thus streamlining transactions and reducing paperwork.
Step-by-step explanation:
The IT system designed to avoid the document matching process and is known as an "invoiceless" system is C. Evaluated Receipt Settlement (ERS). ERS is a process where the receipt of goods is confirmed, and the payment is processed based on the purchase order information without requiring a separate invoice from the supplier. This system enhances efficiency by eliminating the need for manual invoice matching, reducing paperwork, and streamlining payment processes.