Which of the statements is/are correct ?A. In Reformatsky reaction, `alpha-bromo` ester reacts with aldehyde or ketone in the presence of `Mg` to give `beta-hydroxy` ester.B. In Reformatsky reaction, `alpha-bromo` ester reacts with aldehyde or ketone in the presence of `Zn` to give `beta-hydroxy` ester.C. Citric acid is prepared by the reaction of `alpha-bromoethyl` acetate and ethyl oxaloacetate in the presence of `Zn` followed by hydrolysis.D. Citric acid is prepared by the fermentation of molasses in the presence of Aspergillus wentienzymes.