In which of the following pairs are the two numbers reciprocals of one another?

In which of the following pairs are the two numbers reciprocals of one another?

I. $15$ and $-1/15$
II. $\sqrt{2}$ and $\dfrac{\sqrt{2}}{2}$
III. $4$ and $1/4$

A. I only
B. III only
C. I and II
D. II and III
E. I and III

The OA is D

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