单选题
You are operating your database in the manual archiving mode. Currently， your database is configured with the following online redo log groups and members： 
You tried to drop Group 1 from the database but received the following errors： ORA-01623： log 1 is current log for thread 1 cannot drop ORA-00312： online log 1 thread 1： ’D:///ORACLE/ORADATA/TESTDB/REDO01a.LOG’ What might be the reason for these errors？（）
发布日期：2021-01-28
Group 1 is an active or current online redo log group.
Group 1 is an inactive online redo group that has not been archived yet.
The members of the Group 1 are temporarily asymmetric with the members of other groups.
The size of the online redo log members of Group 1 is different from the size of the members in other groups.
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