the *official* seat numbers for each position (9-handed)

An obvious newbie question here -- almost too newbie to post, but what the hell....

I keep seeing different definitions of what seat number each position includes in 9-handed games (preflop). I have noticed this variation in a few books I've looked at and as well posts from the forum. There are more or less 3 common options it seems. The first:

LP = seats 0-1 off the button.
MP = seats 2-4 otb
EP = 5-6 otb
Blinds = 7-8 (obviously)

The second:

LP = seats 0-2 off the button.
MP = seats 3-4 otb
EP = 5-6 otb
Blinds = 7-8


And the last:

LP = seats 0-1 off the button.
MP = seats 2-3 otb
EP = 4-6 otb
Blinds = 7-8

(Sorry, no picture)

I know this may be silly, but I just want to get this simple issue straight and be able to do things like replay my hands and figure out if I played the right hole cards according to position/seat number, etc.

So which is it, gang?

Your first example fits my understanding.