If a database exception occurs in a PolarDB cluster because important data is deleted by mistake, how i can data be restored?

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If a database exception occurs in a PolarDB cluster because important data is deleted by mistake, how i can data be restored?
A . Level-2 backup + Redo log
B . Level 1 backup + Redo log
C . Level-2 backup
D . Level-1 backup

Answer: A

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