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Your database is running in ARCHIVELOG mode. You are performing a user-managed backup of the DATA1 tablespace. You place the DATA1 tablespace in backup mode by issuing the following statement: ALTER TABLESPACE data1 BEGIN BACKUP; While you are performing the backup, an error occurs that causes the instance to terminate abnormally. Which statement about the DATA1 tablespace is true?（）
A:The DATA1 tablespace is automatically taken out of backup mode when the instance aborts.
B:If you restart the database, the DATA1 tablespace will be automatically taken out of backup mode when the database is opened.
C:If you restart the database, the DATA1 tablespace will be automatically taken out of backup mode when the database is mounted.
D:If you restart the database, the database will not be opened.

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出自：Oracle认证

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