What are some key indicators of enemy activity?

Key indicators of enemy activity include the movement of troops and vehicles, as well as any changes to the environment or terrain that might suggest an impending action or buildup of forces. Observing troops and equipment movements provides crucial insights into enemy intentions and capabilities, allowing for better preparations and response. Changes in terrain, such as ground disturbance or new fortifications, can signal enemy maneuvers or positions.

While increased communication among allies and changes in light and weather conditions can be relevant in a broader operational context, they do not directly indicate enemy activity themselves. The primary focus lies on tangible, observable signs such as troop positioning and vehicle maneuvers that signal potential threats. Hence, the best choice reflects the most direct and relevant indicators of enemy activity.