Salesforce Certified Platform Developer II Practice Test 11

Question 1 / 40
AW Computing (AWC) handles orders in Salesforce and stores its product inventory in a filed, inventory_c, on a custom object. product_c. When an order for a product_c placed, the Inventory_c field is reduced by the quantity of the order using an Apex trigger.
AWC wants to real-time inventory reduction for a product to be sent to many of its external systems, including some future systems the company is currently planning.
What should a developer add to the code at the placeholder to meet these requirements?