Which component of the Oracle networking architecture provides character set and data type conversion between different character sets on the client and server？ （）

A.Load data from a disk， tape， or named pipes.
B.Load data into an Oracle database using DML statements.
C.Extract， reorganize， and insert data within an Oracle database.
D.Load data from external files into tables in an Oracle database.
E.Load data into an Oracle database using operating system commands.
F.Load data directly from a non-Oracle database to an Oracle database.

A.After a shutdown abort.
B.When recovering to an SCN.
C.When recovering until a specific time.
D.When a required archived log is missing.

A.Retain the data file backup for 7 days.
B.Run the recover process every 7 days.
C.Destroy the physical backup files every 7 days.
D.Destroy the physical backup files older than 7 days.
E.Retain one backup of each data file for at least 7 days.
F.Keep the catalog information in the control file for 7 days.