Consider the following statements
When a metal or alloy is cold worked
1. It is worked below room temperature
2. It is worked below recrystallization temperature
3. Its hardness and strength increases
4. Its hardness increases but strength does not increase
Which of these statements are correct?
(a) 1 and 3 (b) 1 and 3
(c) 2 and 3 (d) 2 and 4