#### 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.

Published by
Cengage Learning

ISBN 10:
0-49539-132-8

ISBN 13:
978-0-49539-132-6

Only (d) depicts a function from $X$ to $Y$.

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