Answer
$\bf{f}$
Work Step by Step
We can see that there are two humps when we look at the graph of the 3D surface in $\bf{f}$. This shows that the graph of the 2D level curves has two big circular rings.
Hence, our correct option is $\bf{f}$.
University Calculus: Early Transcendentals (3rd Edition)
by Hass, Joel R.; Weir, Maurice D.; Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0321999584
ISBN 13:
978-0-32199-958-0
Chapter 13 - Section 13.1 - Functions of Several Variables - Exercises - Page 682: 31
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