You work as a database administrator for Supportcenter.cn. Client connection requests are failing because the listener is not responding. You want to forward client connect requests to another listener if one listener is not responding. How do you achieve this？（）

A.All control files are opened
B.All redo files are opened
C.The password file is opened
D.The parameter file is opened
E.All online data files are opened

A.Monitor thealert.logfile
B.Enable server-side SQL tracing for user sessions
C.Enable fine-grained auditing for the customer table
D.Enable Fine-Grained Access Control （FGAC） for the customer table
E.Write a database trigger on the customer table on the SELECT event

A.Uses undo data for roll forward
B.Uses Flashback Log for recovery
C.Uses online redo logs to roll back
D.Uses undo data to roll back the transaction
E.Uses Recovery Manager （RMAN） to roll back
F.Uses the System Monitor （SMON） background process to perform instance recovery