Introduce the working principles of the regular ordering method and the quantitative ordering method respectively, what ordering method is used in this question?

The regular ordering method is an inventory management method that replenishes orders at predetermined intervals. Its working principle is: predetermined an order cycle and maximum inventory, periodic inventory checks, according to the maximum inventory, the actual inventory, in-transit order quantity and the number of goods to be out of stock, calculated each time the order batch, issued order instructions, the organization of the order.

The quantitative ordering method is also known as the continuous checking control method or order point method. Its working principle is: continuous monitoring of changes in inventory balance, when the inventory balance falls to a predetermined value, the supplier will be issued a fixed batch order request, after a period of ordering time, the order arrives to replenish inventory.