Which of the following warnings is used to alert the American people about credible terrorist threats?

Question

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In April 2011, the federal government implemented a new alert system, the National Terrorism Advisory System (NTAS), which replaced the color-coded system implemented by Homeland Security. The new two-level system will warn the American public about elevated threats, which warns of a credible terrorist threat, or imminent threat, warning the public that a credible and specific terrorist threat is imminent (U.S. Department of Homeland Security, 2012).

Which of the Following Warnings Is Used to Alert the American