If you were given three options to deal with ISIS, which would you choose?

Diplomacy will not work with folks that want you dead. ISIS and other terrorist organizations have to be seen as a world problem and relentlessly pursued with all the means at our disposal.

Is nuking the sub-continent too radical???

1. There is no diplomacy with these people. They are radical, focused and have an agenda - convert the world to Islam or die trying, and they don't mind the latter.
2. History has proven time and again you can't control ground from the air. Enough on this subject.
3. The parts you forgot:
A. One has to get into their mentality. You have to understand your enemy. In order to do this you got to drop the politically correct BS. Profiling works, others have used it and found out it does work.
B. Understand our western style of government will never work in the middle eastern area because most of these people have no allegiance to a country. If you look back in their history, true country borders were made by Europeans, and that's part of the mess we are still reaping the sour fruit from.
C. These people have no respect for talk unless you first smack them across the head with a 2x4 (metaphorically speaking), then once you got their attention lay down the law.
D. Once you lay down the law (draw line in the sand), then don't back down, they have no respect for that.
E. You have to understand these people have no respect for life(theirs or yours) nor do they respect the way anyone else wants to live, so you better be prepared to deal with them on their own terms.
F. Just remember they don't have ROE, so you'd better review how you limit your own troops.

3. We all know boots on the ground is the only way to get the job done.