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

• 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