单选题
A Backup RB1 at log sequence number 12871 on 5th Jan
B Backup RB2 at log sequence number 15622 on 12th Jan
C Backup RB3 at log sequence 16721 on 15th Jan
D On 20th Jan when the log sequence number was 18112 you realize that there Is a need to a point in time at the beginning of the recovery window. You have all an hived redo log files to date.
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