Correct Answer: Option A

Explanation

\(\frac{1}{\sqrt{2} + 1}\) x \(\frac{\sqrt{2} - 1}{\sqrt{2} - 1}\)

= \(\frac{\sqrt{2} - 1}{2 - 1}\)

= \(\frac{\sqrt{2} - 1}{1} = \sqrt{2} - 1\)

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