Which components are needed for successful and most efficient recovery.（）
- A The backup RB3 and the current online redo log files
- B the backup RB2 and the archived redo log files after the log sequence number 15622
- C Backup R81 and the archived redo log hies after the log sequence number 12871
- D The backup RB3 and the archived redo log files after the log sequence number 16721