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The rain gutter is specifically designed to divert water away from the doorway of a container. Its primary function is to channel water that may flow down from the roof of the container, preventing it from pooling at the entrance where it could potentially seep inside. This feature is crucial in maintaining the integrity of the cargo by protecting it from moisture damage during transit and while the container is stationary.

The door seal gasket, while important for ensuring a tight seal along the door edges to keep out water and air, does not have the function of diverting water away; instead, it focuses on sealing the container once the doors are closed. The three-point latch is a locking mechanism that secures the container doors but does not play any role in water diversion. Similarly, the foot bolt is a secondary locking mechanism to ensure added security for the doors but, again, does not address water management. Understanding these distinctions clarifies why the rain gutter is the correct component associated with water diversion in containers.