What is stereochemical configuration?

A. R and S

B. d and l

prefix R is derived from latin word rectus which means right and prefix S from latin word sinster which means left..R and S are used for naming optical isomers. d and l are also used for representing rotation of plane polarised light by organic compound having chiral carbon.d for dextrorotatory i.e clockwise rotation of PPL and l for leavorotatory i.e anticlockwise rotation of PPL askiitian