题目内容

You are developing an application that performs file backups in the background. The background application will host a Windows Communication Foundation (WCF) service and must be active as soon as the machine is running. The background application will not have a user interface. A front-end application will consume the WCF service and will provide the user interface.You need to choose a host environment for the WCF service. Which hosting environment should you choose? （）

A. Microsoft Internet Information Services (IIS) 6.0
B. Windows Process Activation Services (WAS)
C. A Windows Forms application
D. A Windows Service

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