A.Redo logs were restored from tape for recovery. 
B.The file names are only used when they are copied to tape. 
C.The database was opened with the RESETLOGS option and log numbers restarted. 
D.Log names run in circular fashion; arch_3.arc is re-created by the ARCn process. 
E.A file name is randomly chosen by the archive process; as long as it is unique, it does not have to be sequential.

A.After the COPY command.
B.After adding a data file in the target database.
C.After adding a tablespace in the target database.
D.After adding a tablespace in the catalog database.
E.After dropping a data file in the catalog database.
F.After running SQL Loader to load a large amount of data.