Answer
Only (d) depicts a function from $X$ to $Y$.
Work Step by Step
For an arrow diagram to depict a function, every value in the domain must have exactly one arrow coming from it and mapping it onto a value in the codomain.
Discrete Mathematics with Applications 4th Edition
by Epp, Susanna S.
Published by
Cengage Learning
ISBN 10:
0-49539-132-8
ISBN 13:
978-0-49539-132-6
Chapter 1 - Speaking Mathematically - Exercise Set 1.3 - Page 22: 15
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