The level of inventory of a manufactured product has increased by 8,208 units during a period. The following data are also available: Unit manufacturing costs of the period Unit operating expenses of the period Variable Fixed $10.00 $8.00 4.00 5.00 The effect on operating income if absorption costing is used rather than variable costing would be a Oa. 565,664 decrease Ob. $106,704 increase Oc. $106,704 decrease Od. $65,664 increase 4