Powder metallurgy process involves which of the following?
1. Converting metals such as iron etc. into powder form.
2. Blending powders of metals, then compacting and compressing to desired shape at room temperature.
3. Heating the compressed articles to a temperature above melting point of metal.
Select the correct answer using the code given below:
(a) 1, 2 and 3 (b) 1 and 2 only
(c) 2 and 3 only (d) 1 and 3 only