Examine the following RMAN command:
RMAN> CONFIGURE ENCRYPTION FOR DATABASE ON;
RMAN> BACKUP DATABASE PLUS ARCHIVELOG;
Which prerequisite must be met before accomplishing the backup?
A.
Provide a password for the encryption
B.
Set up an Oracle wallet for the encryption
C.
No setup is required as it is a default encryption method
D.
Both Oracle wallet and password must be set up for the encryption
Yes, answer is B
See
https://docs.oracle.com/cd/E11882_01/backup.112/e10642/rcmconfa.htm#BRADV89467
you will see the following
CONFIGURE ENCRYPTION FOR DATABASE ON;
At this stage, all RMAN backup sets created by this database use transparent encryption by default.
Doing a search for “transparent encryption” on this same page will reveal that a “wallet” is required.