323.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
正确答案是B