Which of the following is a polynomial function in factored form with zeros at –2, 5, and 8?

a)f(x) = (x – 2)(x + 5)(x + 8)

b)f(x) = x3 – 11x2 + 14x + 80

c)f(x) = x3 + 11x2 + 14x – 80

d)f(x) = (x + 2)(x – 5)(x – 8)