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Which one of the following is not the law of dry friction?

[A].	If friction is neglected, the reactions are always normal to the surfaces on contact	[B].	Friction always acts to oppose the relative motion of the free body
[C].	If static friction is acting, the value of the friction force may vary from zero to its maximum value	[D].	The force of friction is always normal to the surface
[E].	All of the above

Answer: Option D