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單項選擇題

What is the impact of the results of the output of the following command？（）  
RMAN> report unrecoverable database； 
Report of files that need backup due to unrecoverable operations 
File Type of Backup Required Name 
4 full or incremental C：\ORACLE\ORADATA\ORCL\USERS01.DBF  

A. There are no backup sets with any backups of the users01.dbf datafile.
B. The users01.dbf datafile has had unrecoverable operations occur in it. It will need to be backed up or some data loss is possible during a recovery.
C. The users01.dbf datafile is corrupted.
D. The users01.dbf datafile backup exceeds the retention criteria.
E. The last backup of the users01.dbf datafile failed and must be rerun.

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