A ball bearing is subjected to a radial load of 2500 N and an axial force of 1000 N. The catalogue gives the following data: Radial factor= 0.4, Axial thrust factor = 1.5, Static load rating = 10000 N, Dynamic load Rating = 7500 N. The bearing life in millions of revolutions is (a) 1 (b) 9 (c) 27 (d) 8