## University Calculus: Early Transcendentals (3rd Edition)

$\bf{e}$
We can see that the surface creates from the middle 4 upwards waves and 4 downwards waves which leads to the graph of 2D level curves with a star-like shape in the middle when we look at the graph of 3D surface in $\bf{e}$. Hence, our correct option is $\bf{e}$.