Multiple Choice

A technical manual author is writing a section on the relationship between radicals and exponents for an internal training guide. To explain why the expression a1na^{\frac{1}{n}} is mathematically defined as the nnth root (an\sqrt[n]{a}), the author points out that raising a1na^{\frac{1}{n}} to the power of nn results in a1a^1 because the exponents multiply to equal 1. Which fundamental property of exponents is the author recalling to justify this definition?

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