053-566

You have lost all your SYSTEM tablespace datafiles (system_01.dbf and system_02.dbf) and the database has crashed.What would be the appropriate order of operations to correct the situation?
A. Mount the database with the startup mount command.
B. Take the SYSTEM datafile offline with the alter database command.
C. Restore the SYSTEM_01.dbf datafile from backup media with the required archived redo logs.
D. Restore all SYSTEM tablespace-related datafiles from backup media.
E. Issue the recover tablespace SYSTEM command.
F. Issue the recover datafile SYSTEM_01.dbf command.
G. Open the database with the alter database open command.
H. Open the database with the alter database open resetlogs command.
A. a, c, f, g
B. b, d, e, h
C. a, b, c, f, g
D. d, a, e, g
E. b, c, f, e, g

　　First you would restore the missing datafiles.Notice in the question that there are two datafiles that were lost.Next you would mount the database and then you would recover the SYSTEM tablespace.Since it is the SYSTEM tablespace,you would not be able to open the database first.Then you open the database with the alter database open command.