题目内容

YourARCHIVELOG-modedatabasehaslostthreedatafilesandshutdown.OneisassignedtotheSYSTEMtablespaceandtwoareassignedtotheUSERStablespace.Youcanchoosefromthefollowingstepstorecoveryourdatabase：
a.Restorethethreedatabasedatafilesthatwerelost.
b.IssuetheStartupMountcommandtomountthedatabase.
c.Issuethealterdatabaseopencommand.
d.Issuethealterdatabaseopenresetlogscommand.
e.Recoverthedatabaseusingtherecoverdatabasecommand.
f.Recoverthedatafileswiththerecoverdatafilecommand.
g.Takethedatafilesoffline.
Whichisthecorrectorderofthesestepsinthiscase？（）

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