What is the polynomial function of lowest degree with lead coefficient 1 and roots i, –2, and 2? f(x) = x3 – x2 – 4x + 4 f(x) = x4 – 3x2 – 4 f(x) = x4 + 3x2 – 4 f(x) = x3 + x2 – 4x – 4