You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  The application allows users to post comments to a page that can be viewed by other users.  You add a SqlDataSource control named SqlDS1. You write the following code segment. （Line numbers are included for reference only.）  01 private void SaveComment（）  02 {  03 string ipaddr；  04  05 SqlDS1.InsertParameters["IPAddress"].DefaultValue = ipaddr；  06 ...  07 SqlDS1.Insert（）；  08 }  You need to ensure that the IP Address of each user who posts a comment is captured along with the user’s comment.  Which code segment should you insert at line 04？（）

• A、A
• B、B
• C、C
• D、D