Which statement is true regarding Oracle Shared Server architecture？（）
- AA dispatcher can support multiple client connects concurrently while a shared server process can be dedicated to only one dispatcher.
- BUnder the Oracle Shared Server architecture, client-user processes connect to shared user processes.
- CEach dispatcher has its own request queue, which is monitored every three seconds by the dispatcher.
- DOracle Shared Server required Oracle Net Service even if the client and shared server processes reside on the same machine.