Select the correct IUPAC name of following compounds :
A. 2R,3S-3-amino-2-carbomoyl butane -1,4-dioic acid
B. 2S,3R-2-amino-3-carbamoyl butane-1,4-dioic acid
C. 2S,3R-3-amino-2-carbamoyl butane-1-4-dioic acid
D. 2R,3R-2-amino-3-carbamoyle butane -1-4-dioic acid
