706. You execute the following command to set the redundancy retention policy in Recovery Manager (RMAN): RMAN> CONFIGURE RETENTION POLICY TO REDUNDANCY 3; Identify the statement that correctly describes the implications of this command.
A.A, when there are already three backups, for the fourth backup RMAN removes the oldest backu
B.When there are already three backups, for the fourth backup RMAN marks the oldest backup as obsolete.
C.the number of backups that are retained is equal to three and it includes full, incremental, and cumulative backups.
D.when there are already three backup, one of the existing backups must be removed manually before taking the fourth backup.
正确答案是B