The systematic name of sucrose is_______?
A. 1-α-D- glucopyranosyl-2-β-D-fructopyranoside
B. 11-α-D-glucopyranosyl-2-β-D-fructofuranoside
C. 1-α-D- glucofuranosyl-2-α-D- fructopyranoside
D. 1-β- D- glucofuranosyl-2-α- D- fructofuranoside