Consider the following statement
An increase in the cobalt content in the straight carbide grades of carbide tools
1. Increases the hardness
2. Decreases the hardness
3. Increases the transverse rupture strength
4. Lowers the transverse rupture strength
Which of these statements are correct?
(a) 1 and 3 (b) 2 and 4
(c) 1 and 4 (d) 2 and 3