Which figure has been packed with unit cubes correctly? A rectangular prism that is packed with unit cubes in four rows, four columns, and one layer. There are three cubes missing.
A rectangular prism that is packed with unit cubes in four rows, two columns, and one layer. There are two cubes missing.
A rectangular prism that is packed with unit cubes in two rows, four columns, and two layers. There are is one cube missing from each layer.
A rectangular prism that is packed with unit cubes in six rows, five columns, and one layer. There are no cubes missing.