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The coefficient of friction is

[A].	The angle between the normal reaction and the resultant of normal reaction and the limiting friction	[B].	The tangent of the angle between the normal reaction and the resultant of the normal reaction and the limiting friction
[C].	The tangent of the angle of the net resultant force with the direction of motion	[D].	The tangent of the angle between the normal reaction and direction of limiting friction
[E].	The tangent of the angle between the horizontal plane and the resultant force

Answer: Option D