单选题When youre performing active database duplication，a backup of what kind is required？（）A A current RMAN backup-set backup is required.B No backup is required.C An RMAN image backup is required.D A manual backup is required.E A duplicate preparatory backup is required.
单选题
When youre performing active database duplication，a backup of what kind is required？（）
A
A current RMAN backup-set backup is required.
B
No backup is required.
C
An RMAN image backup is required.
D
A manual backup is required.
E
A duplicate preparatory backup is required.
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