Consider the following statements: Alloying elements are added to
1. Improve hardness and toughness
2. Corrosion and oxidation resistance improvement
3. Improve machinability and hardenability
4. Increase weight and volume
Which of the above statements are correct?
(a) 1, 2 and 3 only (b) 2, 3 and 4 only
(c) 1, 2 and 4 only (d) 1, 2, 3 and 4