Total surface area of a cuboid = 2(lb + bh + lh). Here lb=180, bh=30, and lh=600. So TSA = 2 × (180 + 30 + 600) = 1620 square m. A cuboid has three pairs of equal rectangular faces: lb, bh, and lh. We add these three face areas and multiply by 2 to include the opposite faces. The answer is in square units, so the correct choice is 1620 m².