What Was the Main Idea Behind the Bush Doctrine

What was the main idea behind the Bush Doctrine?

A) The United States would take preemptive action, even if it had to act alone, in the war on terrorism.
B) The United States would invade a nation supporting or harboring terrorists only if the United Nations Security Council approved this action.
C) The United States would only launch the first strike in the war on terrorism if its allies joined it in a "coalition of the willing."
D) The United States would continue to employ defensive Cold War measures, such as containment and deterrence, when fighting the war on terrorism.