I am confuesed also. How can a company be so biased...... I live in the U.K and we DO NOT have Del Taco here so talk about unfair discrimination, I feel a court case coming.
All of them give the shuttle. The codes also give you 2 days of play time for free, but you can only get time once from each of the four. So having 2 "A" codes doesn't get you any extra time, but having 1 "A" and 1 "B" code does. And it looks like having all four gets you an extra 2 days, for a total of 10 days of free time. And you can use the time even if you haven't purchased the game.
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Any of them. the letters are just for how much free time you get.