（单选题）
Which of the following represents the correct way to perform an online recovery of datafile 4， which is assigned to a tablespace called USERS？（）
A shutdown restore datafile 4； recover datafile 4； alter database open；
B Sql alter database datafile 4 offline； restore datafile 4； recover datafile 4； alter database open；
C Sql alter database datafile 4 offline； restore datafile 4； Sql alter database datafile 4 online；
D Sql alter database datafile 4 offline； restore database datafile 4； recover database datafile 4；Sql alter database datafile 4 online；
E Sql alter database datafile 4 offline； restore datafile 4； recover datafile 4； Sql alter database datafile 4 online；
正确答案
答案解析
略
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