（单选题）
Which statement is true about the PCTFREE setting for the table（） 
AIt sets the minimum percentage of a data block to be reserved to contain chained rows from other blocks.
BIt sets the minimum percentage of a data block to be reserved as free space before the server prevents inserts into the block.
CIt sets the minimum percentage of a data block to be reserved to contain the bitmap used to maintain the free block information.
DIt sets the minimum percentage of a block that can be used for row data plus overhead before new rows are added to the block.
正确答案
答案解析
略
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