You lose an entire redo log group that is in the CURRENT state. What happens to the database instance and how can you recover from the lost redo log group?

Answer: D

Explanation: The instance will shut down or crash when the current redo log file group is lost and you will have to perform cancel-based recovery because the lost redo log group contained committed transactions. A is incorrect because the instance will shut down or crash, and you cannot clear a redo log group that is missing. B is incorrect because you cannot perform complete recovery with a missing redo log file group in the CURRENT state. C is incorrect because Oracle cannot skip a redo log file group.