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.