Find a polynomial function f(x) of least possible degree having the graph shown.
A. f(x) = 8(x + 1)(x - 1)
B. f(x) = 8(x + 1)2(x - 1)2
C. f(x) = -8(x + 1)(x - 1)
D. f(x) = -8(x + 1)2(x - 1)2
Answer: D
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