45. A particle moves along the x-axis under the influence of a potential energy function U(x) = x4 - 8x2. Which of the following values of x correspond to positions of stable equilibrium?
(A) x = 0
(B) x = +2
(C) x = -2
(D) x = +2 and x = -2

(E) x = 0, x = +2, and x = -2

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統計： A(0), B(0), C(1), D(0), E(2) #3847821