For a car taking a turn on a horizontal surface, let N1 and N2 be the normal reactions of the road on the inner and outer wheels respectively.
(a) N1 is always greater than N2.
(b) N2 is always greater than N1.
(c) N1 is always equal to N2.
(d) Either (a) or (b) depending on the speed of the car and the radius of curvature of the road.