A typical lake has three distinct zones (limnetic, littoral and the benthic zone). The littoral zone is the near shore area where sunlight penetrates. The limnetic zone is the open water area where light does not penetrate to the bottom. The third component of the lake habitat is benthic zone which is the bottom of the lake. The profundal zone is the deepest zone in the sea. So the correct answer is 'Limnetic zone'.