You executed the following command to create a tablespace called SALES_DATA：  > 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 inbitmapblocks.
• E、The space utilization description of the data blocks in segments is managed through free lists.MANUAL