You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously. Dim ar As IAsyncResult = cmd.BeginExecuteReader（　） You need to execute a method named DoWork（　） that takes one second to run while the SQL query is executing. DoWork（　） must run as many times as possible while the SQL query is executing. Which code segment should you use?（）

• A、
• B、
• C、
• D、