Match the following.Heat treatmentEffectP:Tempering1.StrengtheningQ:Quenching2.TougheningR:Annealing3.HardeningS:Normalizing4.Softening

• A. P-2, Q-3, R-4, S-1
• B. P-1, Q-1, R-3, S-2
• C. P-3, Q-3, R-1, S-3
• D. P-4, Q-3, R-2, S-1