单选题A small business owner would like to start keeping track of the orders received on a WebSphere Commerce V5.6 site.  The owner would like to receive an e-mail each time an order is completed.  Which of the following subsystems should be configured to im

A small business owner would like to start keeping track of the orders received on a WebSphere Commerce V5.6 site.  The owner would like to receive an e-mail each time an order is completed.  Which of the following subsystems should be configured to implement this requirement？（）