The correct answer is D) All of the above. The tandem working arrangement of pedestal cranes provides several advantages when operating cargo: 1) The cargo discharge can be performed in port or at anchor, giving the vessel more flexibility in cargo handling operations. 2) The cranes enable the handling of heavy cargos without the need for shoreside assistance, making the vessel more self-sufficient. 3) The cargo discharge can be accomplished with controlled pendulation, which allows for precise and stable movement of the cargo. The other answer choices describe individual advantages, but the tandem crane arrangement provides all of these benefits together, making option D the correct and comprehensive answer.