Consider the following parameters:
1. Grinding wheel diameter
2. Regulating wheel diameter
3. Speed of the grinding wheel
4. Speed of the regulating wheel
5. Angle between the axes of grinding and regulating wheels
Among these parameters, those which influence the axial feed rate in center less grinding would include
(a) 2, 4 and 5 (b) 1, 2 and 3
(c) 1, 4 and 5 (d) 3, 4 and 5