What is the first step in the payoff phase of glycolysis?

• A. Reduction of 1, 3-bisphosphoglycerate to glyceraldehyde 3-phosphate
• B. Oxidation of glyceraldehyde 3-phosphate to 1, 3-bisphosphoglycerate
• C. Reversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate
• D. Irreversible conversion of dihydroxyacetone phosphate to glyceraldehyde 3-phosphate