（单选题）
According to your backup strategy， you performed an incremental level 0 backup of yourdatabase. Which statement regarding this backup is true？（）
AThe backup is similar to image copy.
BThe backup contains all used data blocks.
CThe backup contains only unused data blocks.
DThe backup contains all data blocks changed since the last incremental level 1 backup.
正确答案
答案解析
略
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