Total surface area of a cuboid = 2(lb + bh + lh). Here lb=220, bh=20, and lh=275. So TSA = 2 × (220 + 20 + 275) = 1030 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 1030 mm².