Which of the following are the limitations of powder metallurgy?
1. High tooling and equipment costs.
2. Wastage of material.
3. It cannot be automated
4. Expensive metallic powders.
Select the correct answer using the codes given below:
(a) Only 1 and 2 (b) Only 3 and 4
(c) Only 1 and 4 (d) Only 1, 2 and 4