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While selecting the elements of power transmission with speed reduction, the order of preference based on a minimum cost is                        

(a) Spur gear, belt pulley, worm and worm wheel

(b) Belt pulley, spur gear, worm and worm wheel

(c) worm and wheel, spur gear, belt pulley

(d) Worm and worm wheel, belt pulley, spur gear.

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