Actually, I talked with Ed Stark of WotC ( he's a long time gamer friend from back when he was on the East Coast) about this just a week ago. Apply the save first, then apply the resistance and multiply the remaining damage by the vulnerability.
So in your example, the answer is A:
1) Save...
The best way to approach this is to play the modules first. What the RPGA turns into is a form of judging pyramid scheme. One judge runs the mod for 4-6 players and then those players can run it for others without having to "eat" the mod. Part of the RPGA Player Rewards is special cards that...