Your customer would like automatic e-mail notifications to be sent for specific business events.

Verified Answer: A. Order header status update and order attribute update

Short but Comprehensive Explanation: In Oracle Order Management Cloud Order to Cash, business event trigger points can be used to enable e-mail notifications for specific events.The “Order header status update” and “Order attribute update” are among the business events that can trigger notifications12.When these events occur, such as when details in a sales order change, a notification can be sent2.

References:

Overview of Using Business Events with Order Management

Overview of Sending Notifications from Order Management to Other Systems