Match the commonly used manufacturing process for the following products.

A. Thoriated nickel wire	1. Single crystal growing
B. Aircraft turbine blade made form a nickel based super alloy	2. Sand casting
C. Automobile crank shaft made for ductile iron	3. Powder metallurgy
D. Silicon wafers used in the electronic in dustry	4. Investment casting

A. A-1, B-4, C-2, D-3

B. A-4, B-3, C-2, D-1

C. A-1, B-4, C-3, D-2

D. A-2, B-4, C-3, D-1

Answer: Option A