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QUESTION 61
You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to develop an application that connects to a Microsoft SQL Server 2008 database. You add the following table to the database:
CREATE TABLE ObjectCache (Id INT IDENTITY PRIMARY KEY, SerializedObjectData XML)
You write the following code segment to retreive records from the ObjectCache table. (Line numbers are included for reference only.)
01 string s = GetConnectionStringFromConfigFile("xmldb");
02 using (SqlConnection conn = new SqlConnection(s))
03    using (SqlCommand cmd = new SqlCommand("select * from ObjectCache", conn))
04    {
05       conn.Open();
06       SqlDataReader rdr = cmd.ExecuteReader();
07       while(rdr.Read())
08       {
09          …
10          DeserializeObject(obj);
11       }
12    }
You need to retreive the data from the SerializedObjectData column and pass it to a method named DeserializeObject. Which line of code should you insert at line 09?

A.    XmlReader obj  = (XmlReader)rdr[1];
B.    SByte obj = (SByte)rdr[1];
C.    String obj = (String)rdr[1];
D.    Type obj = (Type)rdr[1];