When I come to a stop at a red light I generally...

I assess the situation, and use common sense.
But to answer the poll, typically #3. Only because my commute and the areas I ride are pretty bike friendly, there are alot of bikers, so I like to think the cagers are generally cognizant of others on the road. But I ride defensively keeping my head on a swivel all the time. There isn't much you can do about some jackass running you down from behind, be aware of your surroundings.