Which statements about this prism partially packed with unit cubes are true? Check all that apply.

A prism has a length of 4, height of 3, and width of 3. There are 7 units hidden from view and 7 units missing from the middle layer.
The middle layer of cubes is missing 7 unit cubes.
There are 9 unit cubes stacked in the prism.
There are 7 unit cubes that are hidden from view inside the prism.
The volume of the prism can be found by 12 times 3 because there are 12 cubes in each layer and there are 3 layers of cubes.
The volume of the prism can be found by doubling the number of cubes in the prism because it is half full.