A 'leak' to the New York Times accuses Bolton of preparing for war on Iran:

At a meeting of President Trump's top national security aides last Thursday, Acting Defense Secretary Patrick Shanahan presented an updated military plan that envisions sending as many as 120,000 troops to the Middle East should Iran attack American forces or accelerate work on nuclear weapons, administration officials said.
The revisions were ordered by hard-liners led by John R. Bolton, Mr. Trump's national security adviser. It does not call for a land invasion of Iran, which would require vastly more troops, officials said.

The development reflects the influence of Mr. Bolton, one of the administration's most virulent Iran hawks, whose push for confrontation with Tehran was ignored more than a decade ago by President George W. Bush.

If asked for 'options' the military typically lays out three scenarios. The first is very minor action unlikely to have any effect. The second is what the military sees as reasonable or wants. The third option is fantastically exaggerated. The 120,000 troop deployment is the third option. The number is too high for an attack by air and on sea and too low for an attack on land, i.e. an invasion of Iran. Releasing the third option number is likely designed to rally against such a move.