Five separate force-couple systems act at the corners of a piece of sheet metal, which has been bent into the shape shown. Determine which of these systems is equivalent to a force F = (10 lb)i and a couple of moment M = (15 lb ‹… ft)j + (15 lb ‹… ft)k located at the origin.

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5 lb.f 15 lb-ft 5 lb.ft 5 Ib ft 10 lb 15 lb-ft 10 lb 15 lb-ft 25 lh.ft 2 ft 10 lb 8O .ft 2.5 ft 10 lbNO ft 2 ft 10 lb 15 lb-ft 2 ft 15 lb ft