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？（）

单项选择题TheWebSphereCommercePaymentsarchitectureincludesaPaymentServletandaPaymentEngine.ThePaymentEngineistheONLYcomponentthat：（）

A.writes payment information to the database
B.relays incoming HTTP requests
C.writes payment information to the HTTP server
D.maps authenticated users to merchant roles

单项选择题TheMessagingSubsystemutilizeswhattooltoconvertmessagesintoWebSphereCommercecommands？（）

A.XML Transformer
B.Message Mapper
C.Commerce Studio
D.DTD Generator
E.MQSeries Integrator