What best describes a prudent idea for employing national power in a synchronized way to achieve objectives?

The concept that best describes employing national power in a synchronized manner to achieve objectives is strategy. Strategy encompasses the overall plan and direction that guides the use of national resources and capabilities, integrating diplomatic, military, economic, and informational elements to achieve a nation's political and military objectives. It focuses on long-term goals and outlines how different elements of national power can work together cohesively.

This holistic approach is essential in ensuring that actions across various domains are aligned and effective in achieving strategic objectives. A well-defined strategy allows for the coordination and orchestration of forces and resources, maximizing their impact and efficiency.

While the other choices, such as Courses of Action, Operational Design, and Campaign Plans, play important roles in planning and execution, they are more specific components within the broader framework of strategy. A Course of Action outlines specific tactics or options for achieving objectives, while Operational Design focuses on the conception of operations to achieve strategic goals. Campaign Plans detail the actual execution of operations within that strategic context. Therefore, strategy is the overarching concept that best encapsulates the idea of synchronizing national power to meet objectives effectively.