单选题

Your boss at Supportcenter.cn wants you to clarify Oracle 10g. Which statement regarding the usage of redo log files during instance recovery is true? ()

ATransactions are rolled back using redo log files.

BTransactions are rolled forward using redo log files.

CTransactions are rolled back using redo log files and archived log files.

DTransactions are rolled forward using redo log files and rolled back using redo log files.

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