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单项选择题

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
You create a Web page that has a GridView control named GridView1. The GridView1 control displays the 
| English | Chinese | Japan | Korean | - 88 - Test Information Co., Ltd. All rights reserved. data from a database named Region and a table named Location. 
You write the following code segment to populate the GridView1 control. (Line numbers are included for reference only.) 
01 protected void Page_Load(object sender, EventArgs e) 
02 { 
03 string connstr; 
04 
05 SqlDependency.Start(connstr); 
06 using (SqlConnection connection = 
07 new SqlConnection(connstr)) 
08 { 
09 SqlCommand sqlcmd = new SqlCommand(); 
10 DateTime expires = DateTime.Now.AddMinutes(30); 
11 SqlCacheDependency dependency = new
12 SqlCacheDependency("Region", "Location"); 
13 Response.Cache.SetExpires(expires); 
14 Response.Cache.SetValidUntilExpires(true); 
15 Response.AddCacheDependency(dependency); 
16 
17 sqlcmd.Connection = connection; 
18 GridView1.DataSource = sqlcmd.ExecuteReader(); 
19 GridView1.DataBind(); 
20 }
21 } 
You need to ensure that the proxy servers can cache the content of the GridView1 control. Which code segment should you insert at line 16?()

A.A
B.B
C.C
D.D

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