（单选题）
What is the implication of this command?（）
AThe command produces an error because the retention time cannot be reduced.
BAll historical data is retained but the subsequent flashback data archives are maintained for only three years.
CAll historical data is purged and the new flashback data archives are maintained for three years.
DAll historical data older than three years is purged from the flashback archive FLA1.
正确答案
答案解析
略
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