I'm not sure that there is a cut and dry "
GNAS standard" for this. I've met coaches who know nothing about back tension (back pressure) and suggest "pulling" until you go through the clicker. Pulling isn't the right word for it though. You really push towards the centre of your back with your drawing arm.
The way I was taught was to have a strong and stable front arm, continue holding towards the target (not actively moving the arm forward, just keeping the pressure there) and initiate back pressure with your other arm.
So I wouldn't see it as only one of the above three, sort of a combination of them all.