Which of the following is a polynomial with roots 5, 4i, and −4i?
f(x) = x3 − 5x2 + 20x − 16
f(x) = x3 − 5x2 + 16x − 80
f(x) = x3 − 20x2 + 5x − 16
f(x) = x3 − 16x2 + 80x − 5

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