问题：

[单选] What is the new Oracle Shared Server?（）

A . An improved version of multithreaded server configuration. 
B . A connection pooling configuration where several clients are connected to the same server process. 
C . Two more database servers, which share data by means of database links; the client software is unaware to which server it is connected. 
D . A configuration of Real Application Cluster where the client connection is routed to the least busy instance.&e