You performed a backup of the flash recovery area by using the following command for the first time：
RMAN> BACKUP RECOVERY AREA; 
Which files in the flash recovery area are backed up？（）

A.backup pieces
B.control file autobackups
C.copies of all the parameter files
D.trace file generated using BACKUP CONTROLFILE TO TRACE

A.the location used for control files
B.the location used for redo log files
C.the location set by using $ORACLE_BASE
D.the location set by using $ORACLE_HOME
E.the location set by using CORE_DUMP_DEST
F.the location set by using BACKGROUND_DUMP_DEST

A.The location can be changed only if the flash recovery area is empty.
B.After executing the command， all new flash recovery area files will be created in the new location.
C.The command will generate an error because you cannot change the flash recovery area while the database is open.
D.All the existing files in the flash recovery area will be moved to the new location， and all new Flash Recovery Area files will be created in the new location.