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. shutdownA. a， c， b， dB. d， b， c， aC. f， d， b， c， a， eD. c， a， b， d， fE. a， b， d， e

单项选择题

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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