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? （）

You are developing a client application that consumes a Windows Communication Foundation (WCF) service.
The operation contract is as follows.
[OperationContract]
[FaultContract(typeof(SalesFault))]
string GetSales(string saleId);（）
The service configuration file contains the following line in the serviceBehaviors section.
A divide-by-zero exception is not being handled by the service.
You need to ensure that the exception is caught in the client application.
Which type of exception should the client catch?（）