With respect to metal working, match Group A with Group B:Group AGroup BP : Defect in extrusionI : alligatoringQ : Defect in rollingII : scabR : Product of skew rollingIII : fish tailS : Product of rolling through cluster millIV : seamless tube V : thin sheet with tight tolerance VI : semi-finished balls of ball bearing

• A. P-II, Q-III, R-VI, S-V
• B. P-III, Q-I, R-VI, S-V
• C. P-III, Q-I, R-IV, S-VI
• D. P-I, Q-II, R-V, S-VI