單項(xiàng)選擇題

You receive the following error：  
ORA-19804： cannot reclaim nnnnn bytes disk space from mmmmm limit  
Identify the reason for receiving the above error message？（）

A. The sort area is very small.
B. There is no more space in the Undo tablespace.
C. The flash recovery area is full.
D. The online redo log file is full.

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