The pumpkin patch had two corn mazes, as shown by the shaded and non-shaded sections in the model below.

A model with 4 rows of 7 squares, representing 28 acres, and 2 rows of 7 squares, representing 14 acres.

Which expression is shown by the model?
28 + 14 = 7 (4 + 14)
28 + 14 = 4 (7 + 2)
28 + 14 = 4 (14 + 28)
28 + 14 = 7 (4 + 2)