Your production database is running in archivelog mode and you are using recovery manager (RMAN) with recovery catalog to perform the database backup at regular intervals. When you attempt to restart the database instance after a regular maintenance task on Sunday, the database fails to open displaying the message that the data file belonging to the users tablespace are corrupted.
The steps to recover the damaged data files are follows:
1. Mount the database
2. Open the database
3. Recover the data file
4. Restore the data file
5. Make the data file offline
6. Make the data file online
Which option identifies the correct sequence that you must use to recover the data files?（）

A. Compression can be enabled at the table， tablespace， or partition level for direct loads only.
B. Compression can be enabled only at the table level for both direct loads and conventional DML.
C. Compression can be enabled at the table， tablespace， or partition level for conventional DML only.
D. Compression can be enabled at the table， tablespace， or partition level for both direct loads and conventional DML.

A. It consumes more memory compared with conventional patching.
B. It can be installed and uninstalled via OPatch unlike conventional patching.
C. It takes more time to install or uninstall compared with conventional patching.
D. It does not require down time to apply or remove unlike conventional patching.
E. It is not persistent across instance startup and shutdown unlike conventional patching.

A. Supplemental log must be enabled
B. Supplemental log must be enabled for the primary key
C. Undo retention guarantee for the database must be configured
D. ”EXECUTE “ permission on the DBMS_FLASHBACK package must be granted to the user