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 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.
Response.Cache.SetCacheability(HttpCacheability.Private);

B.
Response.Cache.SetCacheability(HttpCacheability.Public);

C.
Response.Cache.SetCacheability (HttpCacheability.Server);

D.
Response.Cache.SetCacheability (HttpCacheability.ServerAndPrivate);