Three roots of a polynomial equation with real coefficients are 3, 5 - 3i, and - 3i. Which of the following numbers must also be a root of the equation?
a. 5 + 3i only
b. - 3 and 5 + 3i only
c. 5 + 3i and 3i only
d. - 3, 5 + 3i, and 3i
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