Which expression represents the volume of this rectangular prism in cubic units? Press the arrows to expand the image. A rectangular prism filled with unit cubes. The length is made up of a unit cube, a unit cube, a unit cube, a unit cube, and a unit cube. The width is made up of a unit cube, a unit cube, and a unit cube. The height is made up of a unit cube, a unit cube, a unit cube, and a unit cube. A rectangular prism filled with cubes. A 3 space cross times space 12 B 20 space cross times space 4 C 2 space cross times space 5 space cross times space 6 D 3 space cross times space 5 space cross times space 4