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 terminate 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.