1Z0-053 争议题目解析505
考试科目：1Z0-053
题库版本：V13.02
题库中原题为：
505.You configured the default backup device type as disk for RMAN backups. In your database, because
of business requirements, you have to take a simultaneous duplicate backup of the data files when the
RMAN BACKUP command is used.
What must you set using the RMAN CONFIGURE command to achieve this?
A. MAXSETSIZE TO 2;
B. DEVICE TYPE DISK PARALLELISM 2;
C. RETENTION POLICY TO REDUNDANCY 2;
D. DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 2;
Answer: C
争议点：
网上有人说选择D，比如“标记为正确答案，不看answer版”题库。
比如：
Riveore的解析：http://blog.csdn.net/rlhua/article/details/12361883
LuiseDalian的解析：http://blog.itpub.net/17013648/viewspace-1308523/
初步结论：
选择D。