When selecting an observation post, which factor most supports effective surveillance?

When selecting an observation post, which factor most supports effective surveillance?

• A. Choosing a location with long observation, concealment, stable footing, and a favorable line to targets.
• B. Choosing a location with direct line of sight to all seen enemy positions.
• C. Selecting a site near roads to observe traffic only.
• D. Picking a high point with no concealment but broad view.

Answer: (D)