Which code elements needs to be added in the empty lines?

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
You create a stored procedure to insert a new record in the Categories table according to following code segment.

CREATE PROCEDURE dbo.InsertCategory
@CategoryName navrchar(15),
@Identity int OUT
AS
INSERT INTO Categories(CategoryName) VALUES (@CategoryName)
SET @Identity = SCOPE_IDENTITY()
RETURN @@ROWCOUNT

You add the following code fragment. (Line numbers are included for reference only.)

01 private static void ReturnIdentity(string connectionString)
02 {
03 using(SqlConnection connection = new SqlConnection(connectionString))
04 {
05 SqlDataAdpater adapter = new SqlDataAdapter(“SELECT CategoryID, CategoryName FROM dbo.Categories”, connection);
06 adapter.InsertCommand = new SqlCommand(“InsertCategory”, connection);
07 adapter.InsertCommand.CommandType = CommandType.StoredProcedure;
08 SqlParameter rowcountParameter = adapter.InsertCommand.Parameters.Add(“@RowCount”, SqlDbType.Int);
09 …
10 adapter.InsertCommand.Parameters.Add(“@CategoryName”, SqlDbType.NChar, 15, “CategoryName”);
11 SqlParameter identityParameter = adapter.InsertCommand.Parameters.Add(“@Identity”, SqlDbType.Int, 0, “CategoryID”);
12 …
13 DataTable categories = new DataTable();
14 adapter.Fill(categories);
15 DataRow ctegoryRow = categories.NewRow();
16 categoryRow[“CategoryName”] = “New beverages”;
17 categories.Rows.Add(categoryRow);
18 adapter.Update(categories);
19 Int32 rowCount = (Int32)adapter.InsertCommand.Parameters[“@RowCount”].Value;
20 }
21 }

Which code elements needs to be added in the empty lines?

A.
Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.ReturnValue;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.ReturnValue;

B.
Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.Output;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.Output;

C.
Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.ReturnValue;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.Output;

D.
Insert the following code segment at line 09:
rowcountParameter.Direction = ParameterDirection.Output;
Insert the following code segment at line 12:
identityParameter.Direction = ParameterDirection.ReturnValue;

Explanation:
Input – The parameter is an input parameter.
InputOutput – The parameter is capable of both input and output.
Output – The parameter is an output parameter.
ReturnValue – The parameter represents a return value from an operation such as a stored procedure, built-in function, or user-defined function.

ParameterDirection Enumeration
(http://msdn.microsoft.com/en-us/library/system.data.parameterdirection(v=vs.71).aspx)