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You executed the following command to create a tablespace called SALES_DATA： SQL> CREATE TABLESPACE sales_data DATAFILE SIZE 100M SEGMENT SPACE MANAGEMENT AUTO； Which two statements are true about the SALES_DATA tablespace（）
A:The database automatically determines the extent-sizing policy for the tablespace.
B:The segments are automatically shrunk when the contents are removed from them.
C:The allocation of extents within the tablespace is managed through the dictionary tables.
D:The space utilization description of the data blocks in segments is recorded in bitmap blocks.
E:The space utilization description of the data blocks in segments is managed through free lists.

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出自：Oracle认证

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