Which statement is true regarding checkpoints and recovery？（）

• A、A checkpoint defines the highest system change number （SCN）.
• B、All redo entries higher or at the SCN are known to be written to the data files.
• C、Only the redo records containing SCNs higher then the checkpoint need to be applied during recovery.
• D、The LOG_CHECKPOINT_INTERVAL initialization parameter specifies the amount of time between incremental checkpoints.