Total surface area of a cuboid = 2(lb + bh + lh). Here lb=448, bh=42, and lh=384. So TSA = 2 × (448 + 42 + 384) = 1748 square mm. 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 1748 mm².