William Is the Owner of a Made-To-Order Furniture Shop

William is the owner of a made-to-order furniture shop. He maintains extensive catalogues of the designs and customizations that he offers. Once a customer places an order, William buys the required amount of raw materials from his regular suppliers and starts working on the order. From the given scenario, it can be inferred that William follows the _____.

A) push system of inventory control
B) mass production system
C) just-in-time production system
D) flow production system