I always say something like option 4 and in every occasion the other surfer has always been respectful and said "my bad" or something.
Funny story, I remember one time a few years back I was surfing in sea isle one day in the summer, which by the way has the most managable crowds for summer day time surfing, but anyway, some one dropped in on this one guy and I am not sure if it was the first time or not, but this guy flipped out, screaming at the top of his lungs and paddled over to the other guy and punched him. The other guy was trying to get away as this guy was trying to beat the hell outta him. Last I saw of that guy. Me and my buds were like wtf?
Felt bad for him, but its crazy that was the first and last time I saw an actual fight in the water and of all places, sea isle.
