单选题In user-managed backup and recover procedures， how are data files backed up？ （）AUsing SQL commands.BUsing SQL*Plus commands.CUsing operating system commands.DUsing Recover Manager commands.
单选题
In user-managed backup and recover procedures， how are data files backed up？ （）
A
Using SQL commands.
B
Using SQL*Plus commands.
C
Using operating system commands.
D
Using Recover Manager commands.
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