单选题Your database is in the NOARCHIVELOG mode. Since last night’s offline backup， the logs in group 1 have been written to twice. This morning， the SYSTEM data file has become corrupted. Up to what point can it be recovered？（）Auntil the last commitBcannot be recoveredCuntil the last offline backupDuntil the beginning of the last transaction
单选题
Your database is in the NOARCHIVELOG mode. Since last night’s offline backup， the logs in group 1 have been written to twice. This morning， the SYSTEM data file has become corrupted. Up to what point can it be recovered？（）
A
until the last commit
B
cannot be recovered
C
until the last offline backup
D
until the beginning of the last transaction
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