Final answer:
The National Terrorism Advisory System pertains to domestic security concerns and focuses on providing information and guidance related to the threat of terrorism in the United States and its possessions.
Step-by-step explanation:
The National Terrorism Advisory System pertains to domestic security concerns. It focuses on providing information and guidance to the general public, law enforcement agencies, and other stakeholders regarding the threat of terrorism in the United States and its possessions.
For example, the system may issue an alert to inform the public about a credible threat of terrorism or provide guidance on how to report suspicious activities that may be related to terrorism.
Therefore, the correct answer is D) Pertains to domestic security concerns.