The answer is #4.
The Soviets withdrew their missiles following the blockade (as well as the U.S. secretly agreeing to remove theirs in Turkey, which was the main reason why Russia wanted missiles in Cuba)
The U.S. never directly initiated an attack against Havana, Cuba.
The Soviets would NEVER have agreed to let the U.S. inspect weapons facilities in Moscow, and the Soviets never kept their missiles in Cuba following the crisis.