The Reaction Sequence for the Pyruvate Carboxylase Catalyzed Reaction Is

The reaction sequence for the pyruvate carboxylase catalyzed reaction is:
A.formation of N-carbonyl biotin
B.attack of HCO₃− on ATP
C.liberation of P_i
D.formation of carbonylphosphate
E.C-3 carbanion of pyruvate attack on N-carbonyl biotin

A) B, D, A, E, C
B) B, D, A, C, E
C) D, C, B, E, A
D) D, B, C, A, E
E) E, C, B, A, D