What is the following product? 4th root of 7 times 4th root of 7 times 4th root of 7 times 4th root of 7

Each fourth root of 7 is 7^(1/4). Multiplying four identical factors adds the exponents: 7^(1/4 + 1/4 + 1/4 + 1/4) = 7^1 = 7. So the product is 7, choice D.

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