Which statement is true about the Log Writer process?

The checkpoint process (CKPT) signals the Database Writer process (DBWn) to write dirty buffers to data files; CKPT does not signal LGWR - LGWR has its own independent write triggers.

LGWR writes only to the members of the currently active redo log group, not to all redo log groups at once; other groups are inactive and receive no writes until a log switch occurs.

The relationship is inverted - Oracle's write-ahead logging protocol requires LGWR to write redo information before DBWn can write dirty buffers to disk, ensuring that redo records are available for recovery of any data file writes.

When a transaction issues a COMMIT, LGWR is triggered to flush the redo log buffer to the online redo log files before the commit is confirmed to the user. This write-ahead logging behavior ensures that any committed transaction can be recovered even if a subsequent failure occurs, which is the core purpose of LGWR.