How Was the Bush Doctrine Regarding the War on Terrorism

How was the Bush Doctrine regarding the war on terrorism different from earlier strategies that had once been part of Cold War policy?

A) Bush promised to take the war directly to the enemy rather than trying to contain terrorist leadership and actions to the regions where it existed already.
B) The United States and its former Cold War rival, the Soviet Union, conducted a joint military campaign against al-Qaeda in Afghanistan.
C) Bush ordered U.S. military forces to avoid regime changes in enemy nations similar to those that had once been implemented by the CIA in communist-leaning nations.
D) Unlike the Cold War, nuclear weapons of mass destruction were not a deciding factor in developing a military response to terrorist enemies and the nations that supported them.