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The property that effectively helps a NavMesh agent stop itself as it approaches its target is called "Stopping Distance." This setting specifies the distance at which the agent should stop when it gets close to its destination. When the agent is within this threshold, it will gradually slow down and come to a halt instead of abruptly stopping at the target position.

In the context of NavMesh agents, this is particularly important for creating smooth and natural movement behavior in games, as players typically expect characters to decelerate gradually rather than stopping instantly. The Stopping Distance allows developers to fine-tune how close an agent should get to its target before it considers itself arrived, thereby enhancing the overall user experience through more fluid and realistic animations.

Auto Braking is generally related to adjusting the braking behavior but does not specify a distance at which stopping occurs. Therefore, while it influences the stopping dynamics, it does not directly define when the agent will halt. The other options, such as Distance Threshold and Speed Limit, relate to different aspects of agent movement or operational parameters but do not specifically denote the distance for stopping near the target.