If a set of given forces are such that their free vectors build a clos

1.	If a set of given forces are such that their free vectors build a closed polygon, then?
A.	The resultant force and resultant couple are always zero
B.	The resultant force is zero but resultant couple is not zero
C.	The resultant force is zero but resultant couple may not be zero
D.	The resultant force and resultant couple both may not be zero
Answer» D. The resultant force and resultant couple both may not be zero

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If a set of given forces are such that their free vectors build a closed polygon, then?

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