The direct handoff connection method to an Oracle9i Shared Server involves fewer messages than in previous releases of the multithreaded architecture. Which type of message has been eliminated？（）

• A、The initial request from the client to the listener.
• B、Messages between the dispatcher and the shared server background processes.
• C、A redirect message from the listener to the client during client connections.
• D、Round-trip messages between the listener and the shared server background processes.