You lost a data file that belongs to an index tablespace in your database， which operates in ARCHIVELOG mode. Loss of the data file resulted in increased response time on your queries. Which two options would you use to solve this problem？ （）

• A、 Restore the lost data file from the backup， and then flash back the database.
• B、 Restore the data file pertaining to index tablespace， and then recover the tablespace.
• C、 Restore all the data files， and then perform an incomplete recovery to get the tablespace back.
• D、 Restore all the data files， and then perform an incomplete recovery using the backup control file.
• E、 Drop and re-create the index tablespace， and then re-create all of the indexes in that tablespace.