为自己加油

Choose three. You issued this command: RMAN> BACKUP RECOVERY

AREA FORCE; Which three are true?

A.
All files in any previous FRA that have not yet been backed up, are backed up.
B.
All files in the current fast recovery area (FRA) that have not yet been backed
Up, are backed up. 
C.
All files in the current FRA that have been backed up
Already, are backed up.
D.
All Oracle recovery files normally written to the FRA and which have been
Backed up already to the current FRA, are backed up.
E.
All files in any previous FRA that have been backed up already, are backed up.
F.
All Oracle recovery files normally written to the FRA and which have not yet
Been backed, are backed up.
G.All Oracle recovery files normally written to the FRA and which have been
Backed up already to in any previous FRA, are backed up.