You have a read-only tablespace on read-only media. You want to perform a media recovery on the existing data files， but using a backup control file. The backup control file indicates that the status of the read-only tablespace was read/write when the control file was backed up. What should you consider？（）
- A take data files from the read-only tablespace offline before performing a recovery
- B recovery using backup control file is not possible， so restore all the files from the last full database backup， and then open the database
- C drop the read-only tablespace and re-create the tablespace after recovery
- D perform a recovery； status of the tablespace in control file will be changed automatically