The correct answer is option 2, Continental Shelf.

A continental shelf is the area of relatively shallow water that surrounds a continent and extends from the shoreline to the continental slope. It is characterized by a gentle slope and can extend hundreds of kilometers from the coast. The depth of the water on the continental shelf is typically less than 200 meters.

Option 1, Coast, refers to the area where land meets the sea. It includes the shoreline, beaches, cliffs, and other coastal features.

Option 3, Continental Platform, is not a correct term. The correct term is Continental Plateau, which refers to a flat, elevated area of the continental crust.

Option 4, Continental Slope, is the area of steeply sloping sea bed that marks the transition between the continental shelf and the deep ocean floor. It is characterized by a steep drop-off in water depth.