Consider the following statements relating to Rockwell Hardness Testing Method?
1. It is a quick method to determine hardness of industrial components
2. Polishing of test sample is necessary
3. Test load is applied in two stages
4. Hardness of relatively softer metals cannot be determined by this method
Which of the statements given above are correct?
(a) 1, 2, 3 and 4 (b) 3, 4 and 5 (c) 1, 2 and 3, only (d) 2, 4 and 5