Which statement is true regarding Oracle Shared Server architecture？（）

A、A dispatcher can support multiple client connects concurrently while a shared server process can be dedicated to only one dispatcher. 

B、Under the Oracle Shared Server architecture, client-user processes connect to shared user processes.

C、Each dispatcher has its own request queue, which is monitored every three seconds by the dispatcher. 

D、Oracle Shared Server required Oracle Net Service even if the client and shared server processes reside on the same machine.