Total surface area of a cuboid = 2(lb + bh + lh). Here lb=364, bh=70, and lh=520. So TSA = 2 × (364 + 70 + 520) = 1908 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 1908 mm².