【单选题】
A Windows Communication Foundation (WCF) service is self-hosted in a console application. The service implements the IDataAccess contract, which is defined in the MyApplication namespace. The service is implemented in a class named DataAccessService which implements the IDataAccess interface and also is defined in the MyApplication namespace. The hosting code is as follows. (Line numbers are included for reference only.)<br /> 01 static void Main(string[] args)<br /> 02 {<br /> 03 ServiceHost host;<br /> 04 ...<br /> 05 host.Open（ ）;<br /> 06 Console.ReadLine（ ）;<br /> 07 host.Close（ ）;<br /> 08 }<br /> You need to create a ServiceHost instance and assign it to the host variable. You also need to instantiate the service host.Which line of code should you insert at line 04?（）
A、host = new ServiceHost("MyApplication.DataAccessService");
B、host = new ServiceHost("MyApplication.DataAccess");
C、host = new ServiceHost(typeof(IDataAccess));
D、host = new ServiceHost(typeof(DataAccessService));
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