3. (1 point) Structure ABCDEF is supported by a pin at point A, and point F rests on a frictionless horizon- tal surface. Points A and F lie in the xy plane, and portion BCDE of the structure has the same 8 in. z coordinate. For any arbitrary set of applied loads (not just the loads shown in the figure), determine the number of independent reaction forces and moments required at point A. Cooyright The McGlones Inc. Fenced for prediction or disclay O A. A O B. B O C. C O D. D . O F. F O G. G 4 in. A. 0 B. 1 C 12 in. B 4 in. C. 2 E D. 3 8 in. 10 lb 8 in. E. 4 F. 5 F 20 lb G. 6 x