To determine the correct calculation of the area for the model, you would need to know the dimensions (length and width) of the model. Since the question does not provide specific dimensions, I cannot provide an accurate answer to which choice is correct based only on the choices listed.
However, both "ft.2" and "ft. squared" are correct ways to denote area in square feet. If you have the dimensions or further context, I can help you find the right answer. Otherwise, you may want to compare these choices with the specific area you calculated.