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Most discussion--in the media, think tanks, the U.S. government, and elsewhere--has focused on how to prevent Iran from developing nuclear weapons or a nuclear weapons capability. This is not surprising. Like its predecessors and U.S. allies in Western Europe and the Middle East, the Obama administration has said that Iranian acquisition of nuclear weapons would be "unacceptable." Yet a real prospect remains that efforts to prevent Iran from going nuclear will fail. Therefore, an examination of the options that the United States has should Tehran develop a weapon is crucial.