【单选题】
You work as an application developer at Contoso.com. You use Microsoft .NET Framework 3.5 and Microsoft ADO.NET to develop an application that will connect to the Microsoft SQL Server 2005 database. You have completed the following code segment. （Line numbers are for reference only.）  <br /> 01 public IDataReader GetCustomerReader（） <br /> 02 { <br /> 03     SqlConnection con = new SqlConnection（）； <br /> 04     //Set up the connection <br /> 05     con.Open（）； <br /> 06     string sql = "Select * from Customers"； <br /> 07     
A、A
B、B
C、C
D、D
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