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.