When it is mandatory:Stroke and distance must be taken if your ball is out of bounds or cannot be found within three minutes.
When it is optional:You can also choose to play under stroke and distance at any time on the course, from a bunker, penalty area, fairway, or anywhere else — it will always cost just a one-stroke penalty.
How to put the ball back in play:Replace the ball on the exact spot if playing from the putting green, tee it up anywhere in the teeing area or drop from knee height if replaying a tee shot, or drop from knee height within one club length no closer to the hole for all other areas.