A.Drop the affected tablespace, re-create the tablespace, restore the datafiles, and the tablespace. 
B.Take the affected datafile offline (if not already offline), restore the damaged image of the datafile, and then bring it online. 
C.Restart the database in MOUNT mode, restore the damaged datafile, recover the datafile and then open the database with resetlogs.
D.Put the database in RESTRICTED mode, restore all the datafiles in the affected datafile and recover the tablespace, and then put the database in normal operational mode. 

A.A different procedure is required to restore a database from compressed backups 
B.The AS COMPRESSED clause of the BACKUP command provided by RMAN is used to create compressed backup sets and image copies. 
C.Using this command to create backups minimizes the bandwidth consumed.
D.Using this command to create backups improves the performance of the backup process