An object is acted upon by a system of parallel three causing the object to be in state equilibrium. Which of the following statement is not correct

A. the resultant of the parallel forces is zero
B. the algebraic sum of all the moments of the forces is zero
C. all the parallel forces must be equal in magnitude and direction  
D. the sum of forces in one direction must be equal to the sum of forces in the opposite direction

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Correct Answer: C