A.Execute the ALTER DATABASE ARCHIVELOG statement 
B.Select ARCHIVELOG option in the database control and restart the database to apply the changes. 
C.Shut down and start the instance, and in the NOMOUNT state execute the ALTER DATABASE ARCHIVELOG statement. 
D.Shut down and start the instance, mount the database, then execute the ALTER DATABASE ARCHIVELOG statement. 

A.Restore all the data files and open the database
B.Create the data file and performtablespacerecovery
C.No need to restore any file， just recover the database
D.Restore only the system data file and recover the database
E.Restore only lost date file and performtablespacerecovery