Match the material/application in the following cases.

P. Grey cast iron	1. Lathe bed
Q. Austenitic stainless steel	2. Oil piplines
R. High strength low alloy steel	3. Gas turbine engines components
S. Nickel base superalloy	4. Cryogenic service

A. P-1, Q-2, R-4, S-3

B. P-1, Q-2, R-3, S-4

C. P-4, Q-3, R-2, S-1

D. P-2, Q-1, R-3, S-4

Answer: Option A