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What is the correct order of the following commands if you wanted to restore datafile 4， which was accidentally removed from the file system？（）   a. sql ’alter database datafile 4 online’ b. restore datafile 4 c. recover datafile 4  d. sql ’alter database datafile 4 offline’ e. startup  f. shutdown
A: a， c， b， d
B: d， b， c， a
C: f， d， b， c， a， e
D: c， a， b， d， f
E: a， b， d， e

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出自：Oracle认证

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