The open ocean lies over the continental shelf. The seafloor exists not contained in the open ocean. Therefore, the Red circle in the image exists as the correct answer.
What is an open ocean?
The pelagic zone, also understood as the open ocean exists in the area of the ocean outside of coastal areas. The pelagic zone consists of the water column of the open ocean and can be further separated into regions by depth. The word pelagic exists derived from Ancient Greek 'open sea'. The pelagic zone can be thought of as a designed cylinder or water column between the surface of the sea and the bottom.
Therefore, the red circle stands for the open ocean.
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