All the above! The vital area on a whitetail deer is about 10 inches, but you want to be Sure your shot is going in, so 6" or grapefruit size is a good indicator on plain brown paper! The kill is the culmination of all your efforts and the variables of the hunt coming together! Sometimes the odds favor the game! Spend as much time as you can in the field, looking, scouting, and learning the game's habits! Also try to learn how to track the game. You may want to set some range markers when you do start hunting. Keeps you from making a poor shot. Good luck! Hopefully, you get a good shot!
Hawkdancer