help I dont understand

Set up the integral to find the volume of the solid whose base is a disk of radius 2 and whose vertical cross-sections perpendicular to the y-axis are squares. 0 (2 2(4 - 1) dy of, 4(4 - ?) dy of, 2(4 - y') dy 0 2 4(4 - 3?) dy of, 8(4 - y? ) dy None of the answers presented here