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Upon starting your database, you receive the following error: You can choose from the following steps: 1.Restore the database datafiles. 2.Issue the alter database clear unarchived logfile group 1 command. 3.Issue the alter database open command. 4.Issue the alter database open resetlogs command. 5.Recover the database using point-in-time recovery. 6.Issue the Startup Mount command to mount the database. 7.Back up the database. Which is the correct order of these steps in this case?（）
A:1,6,5,4,7
B:6,5,4
C:6,2,3,7
D:1,6,3
E:The database cannot be recovered

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出自：Oracle认证

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