While your other two suggestions are pretty dead on, this one needs some caveat. I would never say never. There are some instances where a fully extended arm, and the sooner the better, will come in handy. Certainly, you don't want to pull punches, but sometimes, the quick fully extended arm (and I'm talking about foil here) will give that person the priority and the preference of the referee.
who cares about proper? if its legal and its gonna get the job done, do it. if u need an extra inch to reach your opponent why not extend fully? true master is not too bright.