In the equation of virtual work, following force is neglected_______________________?

Engineering Mechanics 17/06/2020

A. reaction of any smooth surface with which the body is in contact
B. reaction of a rough surface of a body which rolls on it without slipping
C. reaction at a point or an axis, fixed in space, around which a body is con-strained to turn
D. all of the above
E. none of the above

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