题目内容

In which of the following scenarios is a tablespace recovery required？（）

A. when recovering a lost read-only tablespace from a read-only tablespace backup
B. when recovering a lost read-only tablespace from a read-write tablespace backup when the database is running in ARCHIVELOG mode
C. when recovering a lost read-only tablespace from a read-write tablespace backup when the database is running in NOARCHIVELOG mode and the changes in the online redo log files have been overwritten
D. when recovering a lost read-only tablespace from a read-only tablespace backup using the backup of the control file， the control file was created using the ALTER DATABASE BACKUP CONTROLFILE TO TRACE statement， and this statement was issued when the tablespace was read-only

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