Which of the following statements is false?
(a) There is always a resultant vector required to close a vector diagram rep-resenting a system of coplanar forces acting at a point, which are not in equilibrium.
(b) A vector quantity has both magnitude and direction.
(c) A vector diagram representing a system of coplanar forces acting at a point when in equilibrium does not close.
(d) Concurrent forces are those which act at the same time at the same point.
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