问题:
A . You must ensure that the SALES database is mounted or open.
B . You must restore a backup control file to perform a block media recovery.
C . You must take the tools01.dbf data file offline before you start a block media recovery.
D . You must put the database in NOARCHIVELOG mode to perform a block media recovery.
E . You can perform only a complete media recovery of individual blocks, point-in-time recovery of individual data blocks is not supported.
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