What is the best way to: How can you avoid smashing your thumb while nailing?

pick from the following.
(a). When starting a nail, hold it with your thumb and forefinger right under the point of the nail. You'll be able to keep your eye on your thumb as well as the nailhead, giving you better aim..
(b). When starting a nail, hold it with your thumb and forefinger right under the head rather than lower down. You'll be able to keep your eye on your thumb as well as the nailhead, giving you better aim..
Answer:
(b).