This poll is quite hilarious.
To whomever voted "Nuke", you are pathetic. That is basically inviting terrorists from all nations to unleash hell upon the US. If you think nuking one location, one city, or one country would wipe out all the terrorists reponsible for this latest attack, you are completely ignorant to the workings of independant terrorist cells.
As for the rest of the options, they would be equally uneffective. The US would find it tactically impossible to find all terrorist cells across multiple nations and bomb them.
Frankly, what is most likely going to happen in the US will arrest about a half dozen men of middle-eastern origin, they will be swiftly convicted by a vengeful American jury, and they will be sentenced to death. It doesn't matter whether they did the crime or not, Americans are better off not even knowing the truth, just knowing that someone got caught. The US may bomb some international locations as well, but again, it doesn't really matter if they killed the right people, or even all the people; all the Government has to say is that they did, and people will be satisfied.