They are all wrong. It would be correct to say he nurtured it or set the stage to help them grow by pulling out of Iraq (ie, he lost the peace) but ISIS technically was founded in 1947 as the Arab Socialist Ba'ath Party. They attempted a coup in Syria and were overthrown which is where we have he Assad regime. Their goal has always been to create a single, unified Arab State. They never really had the opportunity to be militant like they were in the 60s until Obama lost the peace in Iraq, opening the door to fill the power vacuum.
It is important to understand the real roots as to understand their real goals and how they've tried to achieve them before.