Given below is the plot of a potential energy function U(x) for a system, in which a particle is in one dimensional motion, while a conservative force F(x) acts on it. Suppose that $$E_{mech} = 8$$ J, the incorrect statement for this system is:

A

at $$x > x_4$$, K.E. is constant throughout the region.

B

at $$x < x_1$$, K.E. is smallest and the particle is moving at the slowest speed.

C

at $$x = x_2$$, K.E. is greatest and the particle is moving at the fastest speed.

D

at $$x = x_3$$, K.E. = 4 J