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單項(xiàng)選擇題

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

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