Examine these two statements:Which three are true about the MRKT tablespace?（）

• A、The MRKT tablespace is created as a small file tablespace, because the file size is less than the minimum required for big file files.
• B、The MRKT tablespace may be dropped if it has no contents.
• C、Users who were using the old default tablespace will have their default tablespaces changed to the MRKT tablespace.
• D、No more data files can be added to the tablespace.
• E、The relative file number of the tablespace is not stored in rowids for the table rows that are stored in the MRKT tablespace.