The plot shown represents the potential energy of a particle that can only move along the x-axis, as a function of the coordinate x. Which of the following statements is correct:
[a] In B and D the force is zero;
[b] The force in B is positive;
[c] A and C are stable equilibrium positions;
[d] The force in D is positive;
[e] A and C are unstable equilibrium positions.
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