ou are in the middle of a transaction updating a very important table. The machine on which adatabase was running reboots because of power outage. This caused a database instance failure.  Which statement is true in this situation（）

• A、The online redo log files and archived redo log files are required to accomplish the recovery.
• B、The uncommitted transaction will be committed at the next startup of the database instance.
• C、The uncommitted transaction is rolled back automatically at the next opening of the database.
• D、The DBA has to perform the recovery on the database to recover the uncommitted transaction.