To accomplish user-managed backup for the USERS tablespace， you issued the following command to put the database in backup mode：   SQL> ALTER TABLESPACE users BEGIN BACKUP；   While copying the file to the backup destination a power outage caused the instance to te minate abnormally.  Which statement is true about the next database startup and the USERS tablespace？（）  

• A、 The database will open，and the tablespace automatically comes out of the backup mode.
• B、 The database will be mounted，and recovery must be performed on the USERS tablespace.
• C、 The database will be mounted，and data files in the USERS tablespace must be taken out of the backup mode.
• D、 The database will not be mounted，and you must restore all the data files for the USERS tablespace from the backup，and perform recovery.