That is something USA and their allies can neutralize easily, Iran can attempt, but will be futile.The second option seems likely to happen, and when that happens, brace for a stock market crash around the globe.
There are other things waiting for stock market to crash, for eg., economic market situation linked with Japan, USA debt climbing up to unimaginable levels in scalar speeds which I think is what Trump is trying to hide. May be if few more coordinates are aligned, can be a perfect storm.