What is the purpose of rigging an 'Orinque' (anchor tripping line and marker buoy) to an anchor before letting go in foul or rocky anchorages?

1. A light line attached to the anchor crown (cruz/cabeza) leading to a surface buoy, used to trip and retrieve the anchor if the flukes become fouled under underwater rocks or cables
2. A safety line attached to the propeller shaft to prevent fishing nets from fouling the blades
3. A specialized towing bridle used to tow disabled water-skiers
4. An electrical grounding wire connecting the anchor chain to the engine block