Which of the following is one of the missions of the Department of Homeland Security (DHS)?

The mission of the Department of Homeland Security (DHS) encompasses a wide range of responsibilities designed to protect the nation from various threats and to ensure national security. One of its core functions is to administer the policies, procedures, and strategies necessary for safeguarding the homeland. This administration includes regulating borders, managing immigration, responding to natural disasters, and protecting the country's critical infrastructure.

While the other terms might touch on some operational aspects related to security or intervention, "administer" directly reflects the DHS's statutory role in managing, guiding, and executing policies that align with the department's goals to enhance the nation's resilience against hazards, both natural and man-made. Therefore, focusing on the concept of administration underlines the organizational approach that DHS takes in fulfilling its mission effectively.