Step 6 in glycolysis is reversible, also occurring in gluconeogenesis, as shown in the image below. Both directions involve reaction coupling and the thioester intermediate. For the reaction in gluconeogenesis, the favorable ___ is coupled via the thioester intermediate to the unfavorable ____. a: oxidation ; phosphorylation b: phosphorylation ; oxidation c: oxidation ; reduction d: reduction ; oxidation e: dephosphorylation ; reduction f: dephosphorylation ; oxidation g: phosphorylation ; reduction.