The data file belonging to the SYSTEM tablespace is corrupted and no backup of the file is available. How do you recover the data file？（）

• A、The data file cannot be recovered.
• B、The date file can be restored from the SYSTEM auto backup.
• C、Take thetablespaceoffline，drop，kand re-create it.
• D、Recovery Manager （RMAN） is used to recover the data file.
• E、The ALTER DATABSE CREATE DATAFILE..commandis used to recover the data file.