Organize the steps of the dihydroxyacetone phosphate/glycerol-3-phosphate shuttle.

a. an electron pair is transferred from FADH2 to coenzyme Q and down the electron chain.

b. DHAP is reduced by NADH in the glycerol to glycerol-3-phosphate.

c. DHAP returns back to the cytosol.

d. flavin-dependent glycerol-3-phosphate dehydrogenase converts glycerol-3-phosphate back to DHAP and reduces FAD to FADH2