问题：

[单选] Which statement correctly describes the function of Oracle9i Cache Fusion feature？（）

A . It provides each session with its own view of the database at a different point in the past. 
B . It enables you to execute scalable applications on a clustered database without having to partition the users or the database tables. 
C . It lets you dynamically reassign memory in your database buffer cache to different block buffer sizes. 
D . It allows you to add new sites to multimaster replication environment without quiescing the master definition site.