Answer
$d$
Work Step by Step
There are many slides sliding down form one side to another which shows that the graph of 2D level curves has many semi-oval rings whose center is on one side and dispersed to the other as shown in the graph $d$.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 14: Partial Derivatives - Section 14.1 - Functions of Several Variables - Exercises 14.1 - Page 787: 35
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