What does the Fast Connection Failover feature of Active GridLink for RAC provide? 

Answer options:

A. instant notification of a RAC node failure so applications never have to retry a transaction that was sent to a node that failed during the transaction
B. near-instant notification of the failure of a RAC node failure that minimizes the possibility connection to a failed node being provided to an application
C. application level notification of a failed RAC node such that an application can retry a transaction if required
D. faster failover for Multi Datasources
E. guaranteed transaction high availability when interacting with an Oracle RAC Database

B

* WebLogic Server supports Fast Connection Failover, a Oracle feature which provides an application independent method to implement RAC event notifications, such a detection and cleanup of invalid connections, load balancing of available connections, and work redistribution on active RAC instances. * A GridLink data source uses Fast Connection Failover and responds to Oracle RAC events using ONS. This ensures that the connection pool in the GridLink data source contains valid connections (including reserved connections) without the need to poll and test connections