You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application contains a DataSourceControl named CategoriesDataSource that is bound to a Microsoft SQL Server 2005 table. The CategoryName column is the primary key of the table. You write the following code fragment in a FormView control： 01 <tr> 02 <td align="right"><b>Category：</b></td> 03 <td><asp：DropDownList ID="InsertCategoryDropDownList" 04 ► 05 DataSourceID="CategoriesDataSource" 06 DataTextField="CategoryName" 07 DataValueField="CategoryID" 08 RunAt="Server" /> 09 </td> 10 </tr> You need to ensure that the changes made to the CategoryID field can be written to the database. Which code fragment should you insert at line 04？（）
- ASelectedValue='<%# Eval("CategoryID") %>'
- BSelectedValue='<%# Bind("CategoryID") %>'
- CSelectedValue='<%# Eval("CategoryName") %>'
- DSelectedValue='<%# Bind("CategoryName") %>'