单项选择题ThedirecthandoffconnectionmethodtoanOracle9iSharedServerinvolvesfewermessagesthaninpreviousreleasesofthemultithreadedarchitecture.Whichtypeofmessagehasbeeneliminated?()
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.