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To enable NavMesh agents to avoid dynamic objects within a scene, it is essential to add a NavMesh Obstacle component to these moving objects. The NavMesh Obstacle component identifies an object as an entity that can obstruct the pathfinding calculations of NavMesh agents. When a NavMesh agent encounters a NavMesh Obstacle, it takes that obstacle into account, adjusting its path dynamically to avoid collisions and navigate around it effectively.

NavMesh Obstacles can be configured to either carve a hole in the NavMesh, which temporarily alters the walkable area, or simply act as a solid entity that agents will steer clear of. This allows dynamic objects—like moving characters, vehicles, or any object that may change position during gameplay—to be properly acknowledged by AI pathfinding algorithms, leading to more realistic and effective navigation behaviors.

The other options do not serve this specific purpose. For instance, while a NavMesh Barrier may suggest an obstruction, it does not exist within Unity's standard components and therefore is not applicable. A NavMesh Entity is also not a recognized component in Unity's navigation system. Finally, a NavMesh Collider is related to defining the collision bounds of static objects but does not facilitate dynamic avoidance by NavMesh agents.