單項選擇題

You are managing a single instance Oracle 10g database that utilizes the following parameters:  Which of the following set of commands must you execute to enable Flashback Database?()

A.  STARTUP MOUNT EXCLUSIVE  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN;
B.  STARTUP MOUNT  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN RESETLOGS;
C.  STARTUP MOUNT EXCLUSIVE  ATLER DATABASE ARCHIVELOG;  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN RESETLOGS;
D.  STARTUP MOUNT  ALTER DATABASE ARCHIVELOG;  ALTER DATABASE FLASHBACK ON;  ALTER DATABASE OPEN;

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