Answer:
The Correct Answer is B
Managing national security
Step-by-step explanation:
The U.S. secretary of defense manages the country's Department of Defense, the federal service accountable for the country's armed duties and related army matters. This federal official acts as the primary security adviser and policymaker.
The main job of the U.S. secretary of defense is to prepare, produce, and execute policies that involve the military affairs and national security of the nation. Also, such an executive is accountable for the department's resource administration and fiscal and program evaluation.