You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. You write the following code segment in the code-behind file to create a Web form：   01 string strQuery = "select * from Products；"   02   + "select * from Categories"；   03 SqlCommand cmd = new SqlCommand（strQuery， cnn）；   04 cnn.Open（）；   05 SqlDataReader rdr = cmd.ExecuteReader（）；   06 ►  07 rdr.Close（）；   08 cnn.Close（）；    You need to ensure that the gvProducts and gvCategories GridView controls display the data that is contained in the following two database tables： the Products database table the Categories database table   Which code segment should you insert at line 06？（）

• A、A
• B、B
• C、C
• D、D