Oracle database backup has the following steps, the correct procedure is:
1, backup Oracle control file
2, backup Oracle archive log
3, Oracle will be in backup mode
4, Oracle will be in normal mode
5, backup Oracle data files
A . 3->5->2->1->4
B . 3->1->5->4->2
C . 3->5->2->4->1
D . 3->5->1->2->4
Answer: C