Jack-up
Semi-submersible
Step 1: The semi-submersible platform uses a Dynamic Positioning System for station keeping, which helps maintain its position without anchoring.
Step 2: Other platforms like the jacket or jack-up use fixed structures or anchors. Tension Leg Platforms use tethers to keep their position.
Step 3: The correct answer is (C) Semi-submersible.
Figure shows an inextensible catenary mooring cable in still water. The submerged weight (per meter length), and the anchor radius are 100 kg/m and 50 m, respectively. If horizontal tension ($T_h$) in the catenary is 1600 kg, the catenary length (AB) is ............. m (rounded to two decimal places). 